Features: Memory storage/recall for review of 10 strings and unlimited number of shots Custom par for single or multiple par time settings with variable delay intervals and hundredth of second setting Dual forward and reverse review function Fixed/random/instant of custom delay available Shot detection microphone with 8 pre-programmed digital sensitivity settings Illuminated LCD display showing total time, splits, shot number, par, first shot time "Spy Mode" for monitoring other shooters and visual starts Optional 50 yard wireless RF capability for CED BigBoard or CED Time Keeper Stopwatch mode for use of the timer as a stopwatch to clock props and other shooters on the range Start beep over 110 dB Rechargeable battery with low battery LCD indicator. Optional external battery pack Two sets of start/review buttons Multiple optional carrying devices Includes wrist and neck band lanyards Includes universal charger Specifications: Weight 6.4 oz Dimensions 3.94" x 1.85" x 0.7" Power supply - internal rechargeable Lithium battery. Will power the unit for up to 30 hours of normal use, 25 hours of match use, before a charge is needed. 1.5 hour charging is sufficient. Beep volume and frequency 110 dB + , 25.000 hz Clock precision displayed 0.01 second Connectors - one auxiliary jack emits a 5 volt DC current in conjunction with the buzzer. One power supply plug, to be used with the optional external battery pack Two year limited warranty