HOW-TO: Pair and Connect your Logitech Harmony Home Hub with Extender with a GE Smart Switch - YouTube
Harmony Hub and Harmony 900 Mini Blaster IR Emitter
Logitech Harmony Companion review: Remote really ties the room together - CNET
Amazon.com: Harmony IR Adapters, Ancable 2-Pack 2.5mm Mono Plug to 3.5mm Mono Jack Connector for Logitech Harmony Hub and IR Blaster, IR Emitter Extenders, IR Repeaters, IR Receivers : Electronics
Amazon.com: 2-Pack Infrared IR Mini Blaster (Emitter) Extender for Logitech Harmony Smart Control Remote, Add or Replace an IR Mini Blaster : Electronics
Harmony Ultimate: Hub and Mini-Blaster Placement Tips - YouTube