Product description: The product consists of a transmitter and a receiver. It adopts an advanced 2.4GHz wireless transmission scheme and has the advantages of a long transmission range, strong anti-interference and high mobility. It can transmit AV signals of DVD, DVR, CCD camera, IPTV, satellite set-top box, digital TV set-top box and other similar devices. Product specification: Transmitter: Frequency Band: 2.4GHz A/V Input Port: RCA Audio Input Level :1Vp-p(Stereo) 433MHz Sensitivity :-110dBm Carrier frequency :38KHz IR Transmitting Range :=5m Power Supply :DC 5V-1000mA Receiver: Sensitivity :-90dBm A/V Output Ports :RCA Video Output Level :1Vp-p(PAL/NTSC) Audio Output Level :1Vp-p(Stereo) IR Transmitter :Superheterodyne 433.92MHz Carrier frequency :38KHz IR Receiving Range :=10m Power Supply :DC 5V-1000mA Attention: 1. This product is more suitable for transmissions in the same floor 2. open area transmition 100 meters 3. can transmit across a wall about 30 meters. 4. the maximum common walls on three sides within every use, transmission distance of 12 meters. 5. when the specific application in the set-top box, regardless of the number of receivers, received the same picture, same channel.NOTICE:Please turn off the Wireless router and make sure there aren"t any goods between the Receiver and transmitter before using this product.otherwise, it may not work or may cause interference.If it still does not work normally,please adjust the products to the appropriate frequency channel,the receiver and transmitter should be at the same channel （the channel from1-4 behind the products）