Multi-Band Atomic Timekeeping (US, UK, Germany, Japan) Tough Solar Power Digital Compass Altimeter w/Alarm & Memory Altitude Barometer Thermometer 100M Water Resistant Full Auto EL Backlight with Afterglow World Time 5 Daily Alarms Countdown Timer 1/100 Second Stopwatch Hourly Time Signal Auto Calendar (pre-programmed until the year 2099) 12/24 Hour Formats Button Operation Tone On/Off Accuracy: ±20 seconds per month (with no signal calibration) Battery Power Indicator Power Saving Function