Digital Display Clock is a Microprocessor based clock which obtains time information from a GPS Receiver or a Network Time Protocol (NTP) server for periodic time updates. The clock comes with a built-in Real Time Clock with battery backup. The product is available with 2” or 4” digit size. The clock is housed in a metallic enclosure. The display indicates time in Hour, Minute, Seconds / Date in a HH: MM: SS (DD) format. It is specially designed for clean room applications. It can be surface mounted or flush mounted into a wall.