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Sometimes when you press to talk the radio doesn't transmit. It happens at random. It is important to glance at the front face and make sure the little light turns red to verify that you're actually transmitting when you PTT. This is so useful since you take your eyes off the road while driving each time you PTT because you can't trust the radio will transmit.You cant change channels from the microphone. The side buttons instead turn up and down the volume! How stupid is that?