JSAUX USB Data Blocker & USB C Data Blocker (4-Pack), Transparent Type A & Type C Data Blocker Only for Charge, Protect Against Juice Jacking, Refuse Hacking Provide Safe Charging

This "data blocker" device plugs between some USB charger and your equipment (for example, your smart phone). I find them especially handy as a "security device" to protect my phone from being hacked when using a "charging station" supplied by some business. Such "hacking" is possible because most phones use the same USB port for charging that is also used for communication between the phone and other devices and computers. So if the "charging station" happens to have been modified by some criminal (and it is not always a criminal working for the company that is supplying the "charger"), the criminal now owns my device instead of me (and such a malicious "hack" can be completed in under a second's time). However, this "data blocker" can prevent this "hack" from succeeding (by blocking all USB data communications to your device). As a result, I keep this "data blocker" in my phone's case, so I always have it with me when traveling (so I can safely use chargers that some business have provided for my convenience).One minor disadvantage of this "data blocker" is that it prevents "fast charging". This is because the "fast charging" protocol requires communications between the charger and the device (to tell the charger how much additional power the device said it was safe to send them). And since this "how much extra power can I safely send you?" communication from the charger is blocked by this device, the charger will never switch from using its basic "slow charge" power levels. So when I really need "fast charging" I instead use my own charger (that I'm pretty confident hasn't been criminally modified) and just plug it into an available power outlet. But I do like keeping these "data blocker" devices around for situations where I don't fully control the charger I'm using.And I've also found these "data blockers" handy when I simply want to charge a computer (be it a phone or a laptop) without instantly triggering its data transfer protocols. For example, I have powered USB hubs connected to multiple computers around my home. And I sometimes want to use a free port on one of those hubs as a "charger" for one of our family's phones. But if I plug the phone directly into the hub, the phone and computer both think I want them to start a data transfer (not disastrous, because I can just tell both devices no data transfer, but this behavior is annoying). However, if I plug one of these "data blockers" between the USB hub and my phone I just get a basic "slow charge" and neither device thinks I want to start a data transfer.NOTE: The version of this "data blocker" devices I purchased was the 4-pack that contains 2 basic USB-A devices, and 2 devices designed for USB-C plugs/jacks. I use both of these devices. The USB-C devices are handy with my cell phone (and also slightly smaller to carry around than the USB-A devices), as I just plug them directly into my cell phone's USB-C jack and then plug the charging cable into the other end of this "data blocker". And the USB-A devices are handy when the "charger" comes with either a basic USB-A plug or USB-A jack (as I then just plug the "data blocker" directly into the "charger", and plug my cable between this "data blocker" and the device I want to charge).

Great little double adapter I purchased at a great price to help protect my electronic data like when used at transport stations, rentals and/or hotels. I can’t wait to use it with my next trip!

Good for car dashcams.I recently lost my dashcam power cable. I got a replacement USB C to Micro USB cable, but it is data transmission capable. My dashcam thought I was connecting it to a computer every time I plugged it into my car, causing the dashcam not to work. After troubleshooting, I found that using a data blocker or a power-only cable would solve my issues. My dashcam was no longer being made, and the manufacturer did not sell a replacement power-only cable. I searched online for a USB C to Micro USB power-only cable unsuccessfully. ChatGPT suggested a data blocker, and I bought it. It solved my data transmission issues right away, and now my dashcam works without issues again.Before you ask, my car does not come with a 12V port. Mazada, in their infinite wisdom, is no longer including that port with most of their models. My only other option was either to get a hardware kit and run the dashcam cable right into my fuse box, or get an electromechanical technician to install a 12V port. Mazda really gave me a headache.All I needed was a data blocker.

The 2 USB-C adapters made my Samsung Galaxy S22+ put a "cable error" message on screen with a known good cable and would not charge. I was about to return the whole thing but both the USB-A data blockers worked so I can deal with that but it is pretty odd. They are not the same circuit inside it seems.

They block data just like they’re supposed to 😐. They do get warm, so some charging capability is lost in heat.

They work as advertised. I used one for my dashcam. The USB on the dashboard had data capabilities. The dashcam could sense this and ask what mode to operate in each time it was powered up instead of just going to dashcam mode.

The variety allowed me to share my purchase with friends who have different brands of phones.

Works but prone to damage if kept in pockets