Perfect for all field and court sports. Shows time remaining and elapsed time. Use one timer to count down to zero, the other to count up from zero. Select time in seconds up to 99 min. 59 sec., or in minutes up to 9999 minutes. Can be used silently or with audible beep confirmation. Automatically resets to preset time at completion. Stop and restart for time-outs. Lock function protects the current setting which is entered. Break-away safety lanyard helps prevent accidents, promotes safe use. Comes ready to use with LR 44 battery. One year warranty.