Place a thermostat anywhere you want. With an INSTEON Wireless Thermostat linked to your INSTEON Thermostat, you get room-specific, customized temperature control. Link it to control other INSTEON devices based on the room's temperature and / or humidity status. Plus, use INSTEON Wireless Thermostat with the Waterproof Temperature Sensor to monitor temperature levels of pools, spas, aquiriums and more. Note: You can add up to two INSTEON Wireless Thermostats to your INSTEON Thermostat.