ACC0800 - Power Supply for the Wireless Thermostat
Power Supply for the Wireless Thermostat allows you to plug the T1100RF
Wireless Thermostat into a standard 120v home outlet so you’ll never
have to change the batteries in your wireless thermostat again!
Venstar has discontinued these plug-in transformers. Here are the specs in hopes you can find a substitute:
Input: plug in 115 volts (normal USA plug voltage)
Output: DC 3.3 volts at least 0.3 Amps