Application: Wireless AV transmission solutions are suitable for large video meeting systems and multimedia class rooms. With an external CCD camera, it can realize real-time field image monitoring in applications such as security system. It can also be used in AV transmission applications where the AV cabling is difficult or expensive. Note: This unit only has Standard Definition compatibility, it uses RCA inputs and outputs, does not work with Sky+ HDMI. Wireless Transmitter Distance äŠ_200m in Unobstructive Place or in wide-open area. Wireless transmitter distance äŠ_20m in obstructive place such as living rooms that are walled off by 1 wood wall or glass wall. It is usually used in wide-open area, not only used in TV BOX or DVD remote operation, but to control TV BOX or DVD remotely via receiver. Please read Troubleshooting enclsoed in the box carefully if you encounter some interference or connection issue. Troubleshootitng Avoid interference-If your family or neighbour were installed 2.4G equipment such as Wireless WIFI or cordless telephone, please choose 5.8G series av sender. Specification: Frequency Band: 5.8GHz Sensitivity:-90DBM A/V Input Port:RCA Video Input Level: 1Vp-p(PAL/NTSC) Audio Input Level:1Vp-p(Stereo) Carrier frequency: 38KHz Power Supply:DC 5V-1000mA Package 1 x Transmitter 3 x Receiver 4 x Power adapter 4 x RCA cable 1 x Operation Manual