PRO Wireless Digital Room Thermostat box contains: 1x Wireless Relay Box 1x PRO Wireless Room Thermostat 1x Desk Stand The PRO wireless digital room thermostat has been designed to provide automatic temperature control of gas or oil fired boiler systems, underfloor heating, electric heating and zoning systems. The PRO is ideal for use with Honeywell Home evohome, where temperature control of a single zone operated by a motorised zone valve or an electric appliance (such as a towel rail is required. The PRO has an ECO button energy saving feature which gives timed setback or boosts temperatures to reduce energy demand. This is a TPI (Time Proportional Integral) control product, which make boilers operate more efficiently and provides close, accurate control. This is continually improved by a self learning adaptive capability. The 'OFF' setting can be used for frost or hypothermia protection, assuming the system time control is also switched on. 'Installer Mode' allows control to be matched to the system and user requirements, adapting minimum on or off times, set point controls etc. The volt free connections are ideal for use with combination boilers or heating zones. Features: Energy saving TPI control ECO button for energy saving mode 30 metres wireless range Two way wireless communications Signal strength indicator Simple user operation 5 to 35�C set point range 'OFF' setting with adjustable OFF setpoint Mains or low voltage switching Two wire connection Energy saving TPI control