Logitech Harmony Remote RF Wireless Extender 915-000044 - NOS - Everything There | eBay
Harmony RF Wireless Extender - Authorized Dealer
Harmony Home Hub Extender + Power Cord, N-R0009, Z-wave ZigBee L302 | eBay
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