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. CHPRSTATDRF - Electronic Wireless Thermostat with Digital Display Large Dial with Digital Display Wireless Communication Between Thermostat and Receiver Electronic Sensor for Accurate and Responsive Performance TPI (Time Proportional & Integral) Control for Heating Efficiency Comfort/Economy or ON/OFF Modes Battery Powered with Low Indication Status (Batteries Supplied) 5°C to 30°C Set Temperature Range 0.5°C and 1°C Temperature Swing Adjustment 5°C Frost Protection Transmission frequency: 433 Mhz (80m Open Field, 30m Indoor Transmission) 16A Receiver Contact Rating (Volt Free) Energy efficiency; ERP Class 4, 2% value Operating Temperature: 0°C to 50° Material: ABS Dimensions: 86mm x 88mm x 38mm