You 't need a battery. Mechanical time manager, no battery, slight when walking, ringtones at of time It is easy to see. It provides a visual effect of the rest of the time. easy to use. Just turn the knob clockwise to the time you need you can better remind the children that time is up. Better time management Three placement positions - 1. Two folding legs can be opened and placed on a flat surface such as a table and counter. Can also hang Display type: pointer Movement: quartz Power type: battery Shell material: ABS Product size: about 190*190*40MM Color: black Package Contents: 1 * 60 timer Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm. Note: 1. Please allow 1-3 mm error due to manual measurement and 1-3g weight error make sure you don't mind before ordering. 2. Due to the lighting of the photos and the difference of monitors, the pictures may not reflect the actual color of the real item. Please make sure you don't mind before ordering, thank you! About Shipping: 1.please pay attention to your delivery address such as: name, street, house number, doorbell/email without name, etc. is correct, or the order will not be delivered correctly. 2.All items will be shipped within 3 business days after the payment is received. Most times you will receive them within 8-12 days then. The specific delivery time is depend on circumstances. 3.During the shopping process, if you have any questions, please feel free to consult us, we will reply you within 56 hours Hope you have a pleasant shopping experience!