Sangamo are a UK manufacturer of time clocks/heating controls, thermostats, immersion controllers & programmers. The brand is also recognised for their Round Pattern Time Switches. PSPSF247 - Powersave Plus Select 24/7 Fused Boost Controller 24 Hour, 5/2 Day & 7 Day Programming 10 On/Off Programs per Day 15 mins, 30 mins, 1 Hour, 2 Hour, 4 Hour, and 6 Hour Boost Function Clear Indication Display Button lock feature Summer / Winter time Change Single Gang Surface (Mount Box Included) or Flush Mounting Supplied with Replaceable BS1362 13A Fuse 13A Switch Rating 240vA Boosts: 15 Mins, 30 Mins, 1 Hour, 2 Hours, 4 Hours & 6 Hour Ingress Protection: IP20 Temperature Rating: T40 Fixing: Surface and Flush Mounting Operating Temperature: 0°C to 40° Material: ABS Dimensions: 86mm x 86mm x 35mm (9mm D without Black Box)