1. 3-key operation, simple and convenient 2. Life waterproof design, can also be used in rainy days 3. ABS plastic shell, wear-resistant, drop-resistant, shock-resistant and anti-skid 4. Good size and comfortable grip 5. The numbers are clear and easy to read 6. Function: double row display, 10 memory, clock display, calendar display, countdown, 4 groups of alarm clocks, metronome, 1/100 timing 7. Power supply: contains a 2032 button battery 8. Material: ABS 9. Size: about 7.9 x 6.2 x 2cm 10. Weight: about 85g