MAG Digital Solar Waterproof Black Noah Precision (Mag) Radio-controlled Watch, MW-550A BK,

Radio-controlled clock that does not require time adjustment Dual power operation using solar power and lithium battery (automatic switching) Suitable for both adults and children (wrist circumference: 4.0cm~22.0cm, case size: 48mm (height) x 41mm (width)) Water resistant for everyday use: 10 ATM Features include: light function (lights up for 3 seconds when the light button is pressed), alarm function (ON/OFF), snooze function, hourly time signal function, stopwatch function (1/100 second), split time measurement, countdown timer, calendar display, and 12/24 hour display switching function.