SPECIAL NOTE: When calibrating the time, first move all the hands to the 12 o'clock position, then put the battery to start adjusting the time from the back. If the pointer is out of alignment or the status of the PIN, you need to disassemble it and reinstall it. Do not use too much force during installation to avoid damaging the pointer. Move all the hands to the 12 o'clock position, make sure the second hand minute hand is kept parallel, then insert the battery and start adjusting the time from the back. Specifications: Material?Wood. Size?12inch. Style:Retro. Non-ticking, silent scanning movement (requires 1 AA battery - not included).