How can i huy just the microphones?

You can buy them from GTD Audio. Go to gtdaudio.net and search for 787

What kind of rechargeable batteries can you use in this unit, they can be used because I try Duracell but they are a little fat and someone broke one.

** DO NOT DO NOT ** Use rechargeable batteries in microphones (or any device) that uses standard batteries!! Standard batteries are 1.5volts. Rechargeable are 1.2 volts. So if you microphone uses two batteries, it is working with 3 volts. However, if you are using rechargeable batteries, you are only giving it 2.4 volts which means it may have reduced range and cause other problems, as 2.4 volts is like weak regular batteries. When someone like Shure provides a rechargeable battery pack option, the pack is actually containing THREE batteries in the pack - even though it fits into a two battery compartment thereby providing 3.6 volts for a 3 volt device. Again... you will have many problems if you try to use rechargeable batteries in a device like this!!

Does this system have echo cancellation built in? (to avoid ringing / resonance)?

It does not and these mics are fairly susceptible to feedback, however you can usually eq the rings out just fine or use the gain control on the receiver to decrease the sensitivity.

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GTD Audio 4x800 Adjustable Channels UHF Diversity Wireless Cordless Handheld Microphone Mic System Ideal for Church, Karaoke, Dj Party, Range 450ft (4 Handheld Mics)

GTD Audio 4x800 Adjustable Channels UHF Diversity Wireless Cordless Handheld Microphone Mic System Ideal for Church, Karaoke, Dj Party, Range 450ft (4 Handheld Mics)

Product ID: 431463440

Details

Brand
GTD Audio
Connectivity technology
XLR
Connector type
XLR
Model name
G-787H
Recommended uses for product
Karaoke

📡450ft wireless range

📶800 selectable frequencies

🔄automatic frequency sync

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R$6738

Duties & taxes included

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Sold byAmazon BrazilDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🎤 Own the stage with flawless wireless freedom!

EFFORTLESS AUTO TUNING - Automatic frequency scanning and transmitter sync mean setup is a breeze—focus on your performance, not tech.
PRO GRADE SOUND CLARITY - 85dB sensitivity and 120dB signal-to-noise ratio deliver pristine audio that commands attention.
EXTENDED WIRELESS FREEDOM - Roam up to 450 feet with confidence—ideal for large stages, churches, or party environments.
TRUE DIVERSITY RELIABILITY - Dual-antenna tech ensures crystal-clear sound with zero dropouts, even in crowded venues.
SEAMLESS MULTI CHANNEL MASTERY - Operate up to 20 systems simultaneously without interference—perfect for dynamic events.

The GTD Audio 4x800 UHF Diversity Wireless Microphone System offers professional-grade sound with 4 handheld mics, 800 selectable frequencies per channel, and a robust 450ft range. Featuring true diversity operation and automatic frequency scanning, it guarantees interference-free, crystal-clear audio for churches, DJs, karaoke, and large events.

Specifications

ASIN	B07KRMX7VH
Antenna Location	Karaoke, Singing
Audible Noise	120 Decibels
Audio Sensitivity	85 Decibels
Brand	GTD Audio
Built-In Media	Microphone
Color	Black
Compatible Devices	Headphone
Connectivity Technology	XLR
Connector Type	XLR
Enclosure Material	Metal
Frequency Range	550MHz 590MHz
Frequency Response	590 MHz
Hardware Platform	Karaoke Machine
Impedance	600 Ohms
Item Dimensions	43.2 x 17.8 x 5.1 centimeters
Manufacturer	GTD Audio
Mfr Part Number	G 787
Microphone Form Factor	microphone system
Model Name	G-787H
Model Number	G 787
Number of Channels	4
Polar Pattern	Omnidirectional
Power Source	Battery Powered
Signal-to-Noise Ratio	120 dB
Special Feature	Wireless
UPC	854318007356
Unit Count	1 Count

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