Product Details Product Size: 11.9 Inch /9.5 Inch Thickness: 0.20 Inch Material: Acrylic Board + Silicone Edging + Plastic Mechanism Housing + Aluminum Clock Hands Note: Do not expose the clock to the rain. The clock is not waterproof. How do I calibrate the time? 1、When calibrating the time, first move all hands to the twelve o'clock position, and then insert the battery to adjust the time from the back. 2、Do not use too much force during installation to avoid damaging the pointer. Move all hands to the twelve o'clock position, make sure that the second, minute, and hour hands remain parallel, and then insert the battery to start adjusting the time from the back. 3、If the pointer is inaccurate or stuck, you need to disassemble and reinstall it by yourself. Please note: The Wall clock is no glass face as the cover. There are slight differences between the picture and the real wall clock caused by light brightness. Because the batteries are limited by international transport, the battery is not contained, please pay attention.