Drayton LP20RF is a dual-channel programmer providing 7-day time control of heating and the hot water pre-heat function if required. The LP20RF is wirelessly linked to the Digistat+RF, which provides temperature control of the heating. The traditional dial on the Digistat+RF makes it really simple for homeowners to adjust the temperature as required. This twin channel programmer offers simple installation, 7-day programming, pre-wired PCB connector, 3 on/off periods per day, a 12 or 24 hour backlit display, pre-programmed on/off periods, and automatic time updates. It features a built-in wireless receiver and a signal strength indicator. Technical specifications include: Type: LP20RF twin channel programmer & digistat+ RF (RF562DR), Power supply: 2 x (AA) batteries (digistat) | 24v dc less than 65mA (LP20RF receiver), Operating temperature: 5°C to 30°C, Radio frequency: 433 MHz, Radio signal range: Up to 30m.