This wall clock is a great addition to your living space or reception area. The 8 1/2in. clock face features a plastic casing and utilizes quartz movement for accuracy. Plastic casing protects the components. Quartz helps provide accurate movement to keep you on track. Clock face measures 8 1/2in. in diameter. Requires 1 AA battery (not included). FirsTime(R) Essential Round Wall Clock, 8 1/2in., Black is one of many Wall Clocks available through Office Depot. Made by FirsTime.