The Pocket Pro timer is an easy to use instrumnet for measuring shot time intervals and is well suited for personal practice or scoring matches. You can review up to 50 shots, forward or reverse. It offers a direct review of shots, split times and shot number. The switch is selectable for instant or random delayed start. It also has a seperate shot sensor and buzzer for best performance and it dispalys time to 199.99 seconds. The ergonomic design allows both right and left handed operation without covering the buzzer or sensor. The display is LCD with half inch tall numbers. The device saves batteries with automatic power turn down after 10 minutes of inactivity. It requires a 9 volt battery that is not included. Low battery indicator. The Pocket Pro timer is an easy to use instrumnet for measuring shot time intervals and is well s You can review up to 50 shots, forward or reverse It offers a direct review of shots, split times and shot number The switch is selectable for instant or random delayed start It also has a seperate shot sensor and buzzer for best performance and it dispalys time to 199