Z-Wave(R) compatible with version 4.4.4; Supports Z-Wave(R) FLiRS functionality; Works on standard HVAC systems with 2-stage heat & 2-stage cool; Works on heat pump HVAC systems with 3-stage heat & 2-stage cool; Can be powered by 24V AC C-wire from HVAC systems; Easy to install & program; USB firmware upgrade available; Mounts on wall or a single-gang junction box; Requires 4 AA batteries;