The Honeywell Home CT410B Manual 4-Wire Thermostat is an easy to install unit compatible with 120, 240 and 227 VAC motherboard systems. The versatility of this manual thermostat is significantly increased by the implementation of a non-polarized 2 or 4-wire connection. The temperature control is enhanced with an actively detecting dual membrane. The versatility of the Honeywell Home handheld thermostat CT410B combines only with its strength to support an impressive 5280W. All these additions and eye-friendly thermostat design make this thermostat the ideal thermostat for a range of applicable settings.