Timeguard TRT038N 7-Day Digital Heating Programmer 3-Channel is a product from Timeguard brand known for its excellent quality and reliability. brand ensures that you can trust their products to perform as promised and be easy to install and use with confidence. TRT038N features three independently programmed channels for controlling central heating and hot water. It includes a user-friendly blue luminescent screen, 7-day programming, 3 timed control periods per day, a 1-2 hour boost function, holiday mode, automatic summer/winter changeover, and a 24-hour factory-fitted rechargeable battery backup. Dimensions: 90 x 135 x 30mm (H x W x D).