Red Button Version 2.0 - 24 GHz Transceiver - Exceptional Accuracy Full 3 digit display Measures velocity in fps - from 150 to 399 fps Measures rate of fire in bps - from 4 to 30 bps Uses standard 9 volt battery - easily installed Automatically resets between shots Required for anyone genuinely serious about the sport of paintball! FOR PAINTBALLS ONLY - NO PELLETS, NO AIRSOFT, NO BULLETS!! Monitor your gun during practice sessions Tune your gun to the max legal limit prior to competition This handheld chronograph utilizes microwave Doppler technology. These are brand new units with instructions and carry the full warranty manufactured by Custom Chronograph - the makers of the big RED Chronographs you have used at fields worldwide and they are every bit as accurate. Sturdy compact design makes it popular for field refs and individual players. One button operation with LCD readout. Extremely small and lightweight! Retails for $149.95! Includes a felt drawstring carrybag. Shipping Weight: 8 ounces Dimensions: 5 1/2"(L) X 2 3/4"(W) X 1 3/8"(D)