Approx. battery life: 2 years Module: 3229 DW5600BB 48.9 x 42.8 x 13.4mm / 60g Shock Resistant 200 Meter Water Resistant EL Backlight with Afterglow Flash Alert Flashes with buzzer that sounds for alarms, hourly time signal, countdown timer time-up alarm 1/100 second stopwatch Free Shipping or In-Store Pickup
