Sewell Direct BlastIR Wireless Pro IR Repeater, Remote Control Extender Kit (IR Emitter and Receiver) (SW-32988) - Newegg.com
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Amazon.com: 2-Pack Infrared IR Mini Blaster (Emitter) Extender for Logitech Harmony Smart Control Remote, Add or Replace an IR Mini Blaster : Electronics
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