Bokit IR Hidden Infrared Remote Extender Receiver Emitter Repeater System 1 to 4 Devices Compatiable Together This mini IR extender can extend IR signal by the CEC channel of the HDMI port. The IR extending distance is up to 60m (it depends on the quality and length of the HDMI cable). Carrier frequency: Broadband (30KHZ-60KHZ) Easy install & operation, and no need external power. 1 to 4pcs remote controllers can be compatiable at most.