Reviews Description: Timeguard NTT03 24 Hour/7 Day Compact Electronic Immersion Heater TimeswitchIntroducing the New range of Compact Timeswitches from Timeguard!FEATURES 16(4)A load rating. 4 ON/4 OFF easy-set programme periods per day, 28 ON/28 OFF programmes per week. Shortest switching time 1 minute. Extra large 'Easy View' screen with blue LED backlighting. Red LED 'Mains ON' and green LED 'Output' indicators for easy viewing. Large easy push programme buttons. Self-cancelling override button to next programme change. Optional 1 and 2 hour boost button. Automatic Summer/Winter changeover. 720 hours rechargeable memory back-up. Fits a standard flush or surface mount box min. 32mm deep.