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
Logitech Infra Red IR Mini Transmitter Blaster IR Harmony, Ultimate, HUB, 900, Elite | eBay
Logitech® Harmony Pro Advanced Remote, Hub and App
Logitech 915-000194 Harmony Smart Remote Control Hub IR Blaster 97855084637 | eBay
Original Logitech IR Mini Blaster for Logitech Harmony Smart Control Remote | eBay