The Timeguard NTT03 7 day Compact Electronic Immersion Heater Timeswitch is a programmable thermostat suitable for heating systems. It features a square-shaped design with a white colour and a flush-mounted installation. This timer has a 4-wire wire configuration and operates on corded electric power with a voltage of 240V. The NTT03 is compatible with a universal range of brands and models, and offers features such as digital display and programmability for up to 7 days. Ideal for efficiently controlling your heating system, this electronic timeswitch by Timeguard is a convenient and reliable choice for your home.