This Greenbrook T109-C Immersion Water Heater Timer Controller is designed to take advantage of off-peak electricity tariffs, helping you save on energy costs. It features a mechanical timer with a boost function, allowing for a 15-120 minute boost facility. The unit includes an 'on' status indicator and a tamperproof cover. Key specifications include a white finish, dimensions of 86mm height, 155.5mm width, and 56.4mm depth, and a weight of 0.030Kg. It operates on 230V AC ~50Hz and has a current rating of 16A. The operating temperature range is -10°C to +55°C, and it has an IP rating of IP20. The display is a mechanical analogue clock face.