The Honeywell Home RTH8560D is part of ... Indicates that when using a 2-wire setup, whether the thermostat draws power through the wires to charge a battery. This may cause some HVAC systems ...

The Honeywell Home RTH9585WF is part ... Indicates, when using a 2-wire setup, whether or not the thermostat draws power through the wires in order to charge the internal battery, which may ...