Notes:1. Our clock has no display of seconds, no 24-hour system and no luminous function.2. The white buttons on the side are mainly waterproof, please do not discard or lose them.3. As the bottom cover is processed with waterproof glue, it may be more difficult to pry.Battery replacement method:Take it off first and slowly pry it open from the edge of the bottom cover to replace it. Replace the back cover (apply a little 502 glue), and re-attach it with spare adhesive paper. Since the bottom cover is processed with waterproof glue, it will be more laborious to pry open. Please pay attention to the risk of damage when changing the battery. Time adjustment method:There is a time calibration hole on the right side, just insert a toothpick to adjust the time. If the buttons are not very sensitive, you can tear them up, adjust the time and install them. The B key is invalid: there is a time adjustment key on the right, you can use a flat toothpick to insert the right key to adjust the time, the up key (A) is the value adjustment key, the down key (C) is the parameter switch key, and the middle key (B ) Is an invalid key.Specifications:Type: sticking clockQuantity: 1pcMaterial: plasticItem color: black Battery: built-in 1* AG4 button batteryWaterproof: IP64Size: 2.75*1cm/1.08*0.39inch (D*H)Net weight:7g/0.25oz