The Horstmann S17r Series 2 Single Channel Timer is a programmable thermostat designed for central heating radiators. With a 7-day program capability, this wall-mounted timer allows for precise control over your heating system. The sleek white design, temperature sensor technology, and line voltage power source make it a reliable and efficient choice for your home. The fast shipping option ensures that you can start enjoying the benefits of this programmable thermostat promptly.