The Perel WC200 (replacement for WC4171) is an extra large digital timer. It has a 4 digit LED display with 3 main functions: Interval Timer, Up/Down Counter / Clock. The Velleman Perel WC200 is a complete unit supplied in a smart enclosure as shown. Powered by rechargeable (not supplied) or the included UK mains adaptor. Ideal as a large timer for the classroom or workplace.