--- product_id: 442084200 title: "20W Wireless Voice Amplifier" brand: "bietrun" price: "R$594" currency: BRL in_stock: true reviews_count: 8 category: "Bietrun" url: https://www.desertcart.com.br/products/442084200-20w-wireless-voice-amplifier store_origin: BR region: Brazil --- # Dual wireless & wired mics 20W peak power UHF clarity 12h battery life, 3h fast charge 20W Wireless Voice Amplifier **Brand:** bietrun **Price:** R$594 **Availability:** ✅ In Stock ## Summary > 🎙️ Mini but mighty: Amplify your voice, amplify your impact! ## Quick Answers - **What is this?** 20W Wireless Voice Amplifier by bietrun - **How much does it cost?** R$594 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.com.br](https://www.desertcart.com.br/products/442084200-20w-wireless-voice-amplifier) ## Best For - bietrun enthusiasts ## Why This Product - Trusted bietrun brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **All-Day Endurance:** Built-in 2000mAh rechargeable battery powers 12 hours of continuous use with a quick 3-hour recharge, keeping you amplified from morning to night. - • **Crystal-Clear Projection:** 20W UHF transmission delivers powerful, distortion-free sound that fills up to 10,000 sq.ft — never strain your voice again. - • **Multi-Source Versatility:** Supports TF card, USB, FM radio, AUX input, and recording (wired mic mode) for a fully customizable audio experience tailored to your professional needs. - • **Seamless Wireless Freedom:** Bluetooth 5.0 connectivity with 60-channel wireless mic pairing ensures interference-free, hands-free presentations and coaching. - • **Compact & Clip-On Convenience:** Weighing just 0.45 lb with a belt clip and waistband strap, it’s the ultra-portable megaphone that moves with you — from classroom to outdoor tours. ## Overview The Bietrun Voice Amplifier is a lightweight, portable 20W UHF wireless megaphone designed for teachers, coaches, and guides. Featuring Bluetooth 5.0, dual wireless and wired microphones, and a rechargeable 12-hour battery, it delivers clear, powerful sound across large spaces up to 10,000 sq.ft. Its compact design with belt clip and multi-source audio support makes it the perfect professional tool to save your voice and command any room. ## Description Buy Bietrun Voice Amplifier for Teachers with Bluetooth, Portable Rechargeable Wireless Voice Amplifier with Headset Microphone Portable Megaphone Speaker for Teaching, Coach, Instructor, Tour Guide: Wireless Headset Microphones - desertcart.com ✓ FREE DELIVERY possible on eligible purchases Review: Mini But Mighty - I was commissioned to do a series of presentations for the local library system, and because my normal voice is fairly soft, I researched for a voice amplification device that teachers use to talk over the din of 30 kids, and found this one recommended. I've only used it so far once, but it did a stellar job, so much so, I returned the one that was over twice the price and about 5 times the weight and size! The larger, heavier, bulkier PA had more (useless) features like FM, which added complexity when pairing with the headset. Also, this bigger, bulker PA said it records the input sound - I ordered twice, and both times this feature failed. This mini but mighty unit pairs automatically to the headset and it is ready to go. I did a decibel meter check, and although this 20 watt was several db lower than the 30 watt much bigger device, it filled the library room satisfactorily with sound. There was no "room" for the lecture, the room was the open library itself! Another impressive feature as well is this once comes with a wired mic as well as a backup. This is different to comparable units that only offered one ... or bundled with a handheld mic, which I don't want for lectures as I need two hands to use the pointer, advance slides and call for audience. Plus, hand held mics for lectures are bad as you naturally drop the mic lower and lower as time goes on to a point it no longer amplifies. The other cool thing about this setup is that it comes with ONE charging cable, that has a Y, one for speaker, the other for headset. The "top of the line" 30 watt PA had two individual charging cords, so easy to misplace. When I did a test run for my next session, the librarian noted a buzzing noise at max volume, so I turned it down a touch so it would not be so "buzzy". My audience is especially a challenge as it it mainly seniors, who are hard of hearing. This next session is in a closed room with tables and chairs for 24, so I do not anticipate any hearing issues, but I will post an update if something goes wrong. So far this is a mini, but surprisingly mighty, inexpensive, PA system has done well. Review: Deceptively powerful - Device looks like an older hand held radio. Headset and lapel mic are good. Great for open areas like gym or large room. Charge holds up fairly nice, but you have to charge ## Features - Warm Tips: Do not put the microphone in front of the voice amplifier when using it, otherwise it may cause noise or statics. - ★UHF 20W Voice Amplifier:The Bietrun voice amplifier adopts UHF transmission, with 20W peak power to output powerful, clear, crisp and no noise & distortion sound. ★It covers about 10000 sq.ft (1000 ㎡), and the stable performance perfect for amplifying your sound and saving your throat. - ★Rechargeable and Long Battery life: Personal voice amplifier built-in a 2000mAh rechargeable lithium battery, works 12 hours at max volume and takes only 3H with a full charge.★The wireless microphone can be used for about 6 hours. ★2 in 1 charging cable(Included) charges amplifier and wireless mic simultaneously.★If no input signal is detected within 20 seconds, speaker will enter sleep mode automatically to save power. - ★Portbale, Lightweight and Compact: The speaker is a portable public address system.★Weights only 0.45 lb/204g, equipped with a back clip to fix the device at your belt or pocket, or you can hang it around your waist with the included waistband belt. ★You can use this in any setting from indoor to outdoor use, perfect for teachers, coaches, training, presentation, tour guide, classrooms etc. A big help in speaking to 50+ members in your group. - ★Bluetoothe & Multi-function: Touch the SOURCE button 3 times to switch to bluetooth 5.0(30M) mode, then turns on Bluetooth on the phone, search "Bietrun” and pair it. ★Support TF(Micro SD) card, USB Disk, FM radio, Recording(Only in wired mic mode), 3.5mm AUX audio input and touch display.★You can long press Play/Pause button to repeat single tune or loop all music. ★Please make sure the TF card/USB Disk(Not included) is inserted before recording. - ★Wired and wireless Microphone Headset: Easy to Use.★Insert the wired microphone into the MIC jack to use. Or turn on the wireless mic, it will pair automatically within 3S.★The wireless mic owns 60 channel, you can short press the Pair button on the wireless mic to avoid interference.★Two microphone headsets are lightweight and adjustable.You can adjust the distance between the microphone and mouth with its flexible gooseneck. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B09P2T2FP7 | | Antenna Location | Singing | | Audio Input | Wired microphone, Wireless microphone, 3.5mm AUX audio input, TF card | | Best Sellers Rank | #30,753 in Musical Instruments ( See Top 100 in Musical Instruments ) #162 in Wireless Headset Microphones & Systems | | Brand | Bietrun | | Built-In Media | Charging Cable, Voice Amplifier, Waistband Belt, Wired Microphone Headset, Wireless Microphone Headset | | Color | Black | | Compatible Devices | MP3, Smartphone, TF Card, U DIisk | | Connectivity Technology | Bluetooth, UHF | | Connector Type | Aux | | Customer Reviews | 4.1 out of 5 stars 257 Reviews | | Enclosure Material | Metal, Plastic | | Item Dimensions | 3.54 x 1.18 x 4.52 inches | | Item Weight | 300 Grams | | Item dimensions L x W x H | 3.54 x 1.18 x 4.52 inches | | Manufacturer | Bietrun | | Mfr Part Number | TS-230 | | Model Number | TS-230 | | Mounting Type | back clip | | Number of Channels | 60 | | Output Wattage | 20 Watts | | Power Source | Battery Powered | | Warranty Description | One Year warranty | ## Product Details - **Brand:** Bietrun - **Color:** Black - **Compatible Devices:** MP3, Smartphone, TF Card, U DIisk - **Connectivity Technology:** Bluetooth, UHF - **Item dimensions L x W x H:** 3.54 x 1.18 x 4.52 inches ## Images ![20W Wireless Voice Amplifier - Image 1](https://m.media-amazon.com/images/I/81QYt53POyL.jpg) ## Questions & Answers **Q: Should we carry all the time during conference or can we place it on somewhere on table** A: I give tours with it in my vehicle and I sit the speaker in the area of the passengers and it works great **Q: no charger included?** A: Call the sale people. Usually, these kits have a USB connection with them. **Q: How to I get my iPhone music to play through the amp while simultaneously speaking into the wireless head set mike to call out line dance steps?** A: I connect my iPhone via bluetooth to the speaker I'm using, and that's where my music comes from. (I use this mic to teach a fitness class, so my microphone plug is connected to a second speaker in the studio.) **Q: Will i be able to hear my students through this device?** A: The headset doesn’t cover your ears, so hearing things is all based on how loud your music is ## Customer Reviews ### ⭐⭐⭐⭐⭐ Mini But Mighty *by G***N on August 18, 2023* I was commissioned to do a series of presentations for the local library system, and because my normal voice is fairly soft, I researched for a voice amplification device that teachers use to talk over the din of 30 kids, and found this one recommended. I've only used it so far once, but it did a stellar job, so much so, I returned the one that was over twice the price and about 5 times the weight and size! The larger, heavier, bulkier PA had more (useless) features like FM, which added complexity when pairing with the headset. Also, this bigger, bulker PA said it records the input sound - I ordered twice, and both times this feature failed. This mini but mighty unit pairs automatically to the headset and it is ready to go. I did a decibel meter check, and although this 20 watt was several db lower than the 30 watt much bigger device, it filled the library room satisfactorily with sound. There was no "room" for the lecture, the room was the open library itself! Another impressive feature as well is this once comes with a wired mic as well as a backup. This is different to comparable units that only offered one ... or bundled with a handheld mic, which I don't want for lectures as I need two hands to use the pointer, advance slides and call for audience. Plus, hand held mics for lectures are bad as you naturally drop the mic lower and lower as time goes on to a point it no longer amplifies. The other cool thing about this setup is that it comes with ONE charging cable, that has a Y, one for speaker, the other for headset. The "top of the line" 30 watt PA had two individual charging cords, so easy to misplace. When I did a test run for my next session, the librarian noted a buzzing noise at max volume, so I turned it down a touch so it would not be so "buzzy". My audience is especially a challenge as it it mainly seniors, who are hard of hearing. This next session is in a closed room with tables and chairs for 24, so I do not anticipate any hearing issues, but I will post an update if something goes wrong. So far this is a mini, but surprisingly mighty, inexpensive, PA system has done well. ### ⭐⭐⭐⭐⭐ Deceptively powerful *by R***. on February 26, 2026* Device looks like an older hand held radio. Headset and lapel mic are good. Great for open areas like gym or large room. Charge holds up fairly nice, but you have to charge ### ⭐⭐⭐⭐ Lots of features …. Fills a room … practice beforehand. *by B***O on February 16, 2023* I used to give speeches for international engineering events and have portable PA systems already, that runoff of 12v Gel cell batteries. I like the fact that there are three ways to transmit and receiver. UHF which is the default, or Bluetooth which is the second choice, and FM which is similar to the old radio shack video microphones. The unit is lightweight it has enough power to fill a room of about 40 people. I just set the speaker on the desk near where I am talking. I wear the headset microphone around my neck and not on my head and bend the microphone up to my lips. What the instruction manual does not make clear is that the controls that are printed on the case of the speaker are in fact touch controls. I saw the labels and looked for the switches, and did not find any. I took a BROTHER tape label maker, and duplicated ALL notations that were printed on the speaker case, and on the headset microphone, because “in battle“, You cannot fumble for ammunition, so to speak. Staring at the speaker like the ape in 2001 Space Odyssey looking at a stick, wondering about something, is not good. It took several hours, as I bought two sets. The “manual” is your typical micro fold-in that is almost unreadable, and confusing, so I photographed each page with my iPhone, and cropped and enhanced each page, and printed them out 8-1/2x11 inches, and put a cover on it. Then, playing with the labeled headset microphone and speaker while reading the large print manual, figured out the difference between what was printed … and practical reality. It is a well made, three frequency set, and I may buy more. I strongly suspect there is no “handshaking” between headset and speaker in UHF MODE, so additional speakers can be added for larger rooms. I will test that, later. Synopsis: I am very happy with my purchase of two complete sets. Like a professional gunfighter … practice is essential! ## Frequently Bought Together - Bietrun Voice Amplifier for Teachers with Bluetooth, Portable Rechargeable Wireless Voice Amplifier with Headset Microphone Portable Megaphone Speaker for Teaching, Coach, Instructor, Tour Guide - Akingdleo 2 pcs Portable Lapel mic 3.5mm Audio Compatible with Voice Amplifiers S6 - WERJIA Hard Carrying Case for Zoweetek/SHIDU Voice Amplifier Portable with Rechargeable Wired Microphone (Case Only) --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.com.br/products/442084200-20w-wireless-voice-amplifier](https://www.desertcart.com.br/products/442084200-20w-wireless-voice-amplifier) --- *Product available on Desertcart Brazil* *Store origin: BR* *Last updated: 2026-05-13*