Honeywell CG511A1000 Clear Locking Thermostat Cover Guard, 3 Pack, is designed to protect your thermostat from unauthorized access and tampering. This genuine OEM Honeywell part fits Honeywell thermostat families including RTH5, RTH6, RTH7, RTH8, and CT3, and is compatible with medium-sized thermostats measuring 6-1/16 in. x 5-1/16 in. x 2-5/8 in. or smaller. Each pack includes three clear plastic thermostat covers with a secure lock and key system for easy use, making it ideal for use in offices, rental properties, schools, or any location where thermostat security is important. The locking thermostat cover guard helps prevent unwanted adjustments, ensuring consistent temperature control. This thermostat security cover is made from durable clear plastic, allowing easy visibility of the thermostat display while providing reliable protection. Installation is straightforward, but professional installation is recommended for safety. Includes three brand new, unused covers backed by a 30-day money-back guarantee. The Honeywell CG511A1000 is a practical solution for anyone needing a lockable thermostat cover to maintain control over heating and cooling settings.