This boiler control switch is wired directly to your boiler and has three set temperature modes; running, standby and away. When connected to the Lightwave Home Thermostat (LW921) you can design your own heating schedules and control temperatures either from your home or via the Lightwave App (Lightwave WiFi Link required). Suitable for indoor usage. Light power indicator. Fixings included for assembly. Size H9.6, W9.4, D2.2cm.