No battery is neededJust wind it up and set a time. The mechanical timer will work. Super cute timer for kids, great for cooking lovers. A handy tool to have in the salon or at home. Perfect for timing children's activities Unique designThis cute timer is made of plastic. Inside, it is made of precision steel. Unique shapes suitable for all ages. Easy to use and clean: wipe with a damp cloth. Cute Timer Charming design adds a cute focal point to your kitchen gadgets. The super adorable accessory adds more fun and practical element to your home. Cute timer for kids a lot. Great gift choice Mechanical kitchen timer packed by high quality independent gift box. Each piece is inspected before shipment. Perfect gift for almost any occasion: anniversary, mother's day or anniversary for your girlfriend, boyfriend, family, etc. Note Tip The timer already installed anti-twist device, please do not counterclockwise directly from 0, otherwise you will damage the timer. it will not work and alarm. Rotate clockwise to 55 and no higher than 0, then rotate counterclockwise at any time. The deviation is +/-5% according to industry standards. Not all mechanical time managers are accurate to the second.