About This 24V C wire power adapter for thermostat: plugs into your standard 110v/ 120v outlet and converts to 24V, 500mA Designed for thermostats power supply: widely applied for thermostats, powers up smart thermostats Compatible with Nest, Ecobee, Sensi, Hive, etc.; Charge for thermostats directly, without needing to remove your thermostats to charge up the battery, convenient and practical to solve the problem of "thermostats low battery" UL certified: UL certification passed, stable and durable 24V transformer for thermostats Easy installation: 2 pin non-polarity wires support easy and quick install, 23 ft cable is long enough to plug it into an electrical outlet inside or outside your house Packing list: 1 x C wire adapter, 1 bag (50 pieces) of cable clips; The brand mentioned above is just for demonstrating compatibility Overview Brand : Hotop Power Source : Adapter,battery Powered Product Dimensions : 3.54"D x 3.54"W x 2.76"H Mounting Type : Wall Mount Current Rating : 0.5 Amps