NB101R(Rx) IR Extender is the Receiver Unit of NB101 Kit. Maximum Receivers for NB101 Kit are  4 Receivers. NB101 IR Remote Controller can be used at the receiving end to realize the function of a wireless control of devices from another place. Technical Details IR receive frequency range: 34 KHz to 60 KHz IR transmit frequencies: 38 KHz & 56 KHz IR receive range: 8 Meter IR Receiver: 31(L) × 17(W) × 13(H) mm IR Emitters: 13(L) × 8(W) × 5.5(H) mm IR Receiver: 1.5 Meter IR Emitters: 1 Meter Network cable: RJ45 Receiver Block: 0.070Kg