After testing, the signal quality started to gradually fade from 5.5km. Battery life satisfactory

It is quite good for their money, instead of a mobile phone in outdoor activities (skiing, biking, hiking, etc.) it works quite well. It is not professional so we cannot rate it as such. The battery life is satisfactory (it takes several hours to charge) and the range, if there are no obstacles in a straight line, is about 2-3 kilometers. With obstacles in the middle, the distance drops dramatically. I bought the same set twice and I hope they all play together (which should work logically, since they operate on the same frequencies).

It is used in a professional space on 3 floors. No problem with the range it is used in. The AAA batteries with 300mah each do not last even a second day. I ordered extra batteries with 900mah. Otherwise, they have served us well for their simple use

I could never change the channel. The (rechargeable ones) are weak. The range of it (in a straight line) is up to 1500-1800 meters. Good for home-garden...