Small, clear thermostat guard prevents unwanted/unauthorized temperature on your thermostat. Includes built-in lock and key. Fits the following Honeywell thermostat models: CT87, CT3x without the wall plate and the RTH5100B (guard must be removed to access this product's battery door).
Product Measures: 13 wide by 8.75 long by 9.5 tall/deep
Features:
•Fits the following Honeywell thermostats
•Covers CT87 (Round) models
•Covers CT30, CT31 and CT33 mod
Dimensions: 8.75″ x 13″ x 9.5″.