I lost my RC4 during a routine ride yesterday. The plastic clamp gave way and off it flew. I retraced my route a few hours later and found pieces of the wreckage. A suggestion might be to fashion a ring and tether so that if the unit clamp fails, the unit itself doesn't go flying off and smash into a billion pieces. Just a thought and would save the RC4 owners a lot of grief.
Tether for RC4 Remote