1. Button design, comfortable and not stuck, reinforced, durable
2. Waterproof for life, waterproof against rain and sweat, just wipe it dry after use
3. Can be turned off, the clock does not need to be reset, save energy
4. Function: stopwatch, clock, calendar, countdown, alarm clock, metronome, shutdown, mute
5. Power supply: contains a CR2032 button battery
6. Material: ABS
7. Screen size: about 3.5x2.3 cm
8. Overall size: about 7.5x6.2x2.1 cm
9. Weight: about 65 grams