Competition Electronics Pocket Pro II Timer CEI4700 Shot Timer and Purchasecorner Polish Cloth Bundle Size fits nicely in your hand with the start button on the side. Powerful 1,500Hz buzzer transmits well through hearing protection Separate shot sensor and buzzer for best performance. Large buttons are positioned with enough space for big hands. Intuitive menu and navigation thats easy to learn and remember. Automatically turns off after 10 minutes of inactivity. Powered by one 9 volt alkaline battery (not included) for approx. 20 hours of use and easy replacement. Pocket Pro II and PurchaseCorner Polish Cloth Bundle comes with 2 year warranty