Casio - CMD30B1A TV / Cable Box / VCR Remote Control, Daily Alarm 1/100 second stopwatch, Hourly Time Signal Auto Calendar, 12/24 Hour Formats Accuracy: +/-15 seconds per month , Battery CR2032 Approx. battery life: 15 months, Module 1173, Size of case/total weight: 43.5 x 38.5 x 11.5mm / 40g