- Size: about 6.5x7cm 2. Material: plastic 3. Purpose: cooking, baking, learning 4. Description: The time manager is a mechanical movement, no need to install or replace the battery 5. Applicable places: study room, office, bedroom, living room, kitchen, bathroom Maintenance and use matters 1. When rotating to the end, do not use excessive force to avoid damage to the built-in movement. 2. Do not repeat the rotation back and forth many times to avoid damage to the built-in movement. 3. The timer shell is made of plastic, please do not throw, drop or smash the timer to damage the timer.