Energy saving time proportional and integral (TPI) control with optimum start, delayed start and optimum stop energy saving technology
Wireless signal strength indicator operating at 868 MHz with a communication range of 30 metres in typical residential buildings
Operating temperature range from 0 to 40°C
IP30 Rated
ST9420C requires a 230V AC power supply, DT92E requires 2 x AA size, 1.5V alkaline batteries (supplied), CS92A requires 2 x AA size, 1.5V alkaline batteries (supplied)
ST9420C has two single poles, double throw SPDT relay as a switch type
ST9420C is 99 x 145 x 35mm (h x w x d) and DT92E is 92 x 90 x 27mm (h x w x d)
7 day programming (7 day, 5/2 day or one day) with a choice of 3 different presets for energy and time saving