The different of Retevis RT21 and RT7

The different of Retevis RT21 and RT7 RT21 and RT7 all is the simple, easy to operate, functions streamlined commercial use of walkie-talkie. Let’s we check the RT21 and RT7 Features: RT21 1.Professional analog two way radio, it has better quality & hand feeling and more powerful functions than H777. 2. One meter free fall, two…