new and high quality,buy with confidence. TX means transmitter, RX means receiver. This wireless extender transmits HD audio video signals through the built-in wireless transmission protocol. Let you enjoy large screen wirelessly and easily. It is widly used for Big screen video Conference / home entertainment / online learning / business speech/education training /playing game etc.more shocking,more relax, and is better for protecting eyes. It breaks the HD cable transmission distance limit, No complicated cable or wire installation needed. so setup is quick and easy, without worrying about wiring problems ,saving decoration costs, the transmission distance can up to 300m under one to one mode in barrier-free open space. It supports Full HD 1080P 60fps and lower resolution. No need to install driver or apps, no need extra wifi, or internet, pair and works,so easy. It works with most 1080p video source devices,such as TX connect to DVD, DVR, TV Set-top Box, HD camera, Notebook, for PS 3/4/5 etc, video source devices RX connect to HDTVs , projectors, monitors, etc. display devices. Pls Note: 1. The RX cannot work alone ,you can buy max. 4 RXs to use with 1 TX (RX=Receiver,TX=Transmitter) 2. Transmission distance vary depending on the usage environment. Walls, the degree of obstruction and with the increase of RXs,etc. shorten the signal coverage or cause obvious signal loss,our descripiton is only for reference, the effect of use finally depends on the actual situation. we advise you use it in a barrier-free space for a best effect. 3. The IR function only works under one TX to one RX mode. Colour:Black Material:Plastic Package Contents: 1 * Video Transmitter 1 * Video Receiver Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.