Product Introduction: Qkens products,Brand new and high quality ,buy with confidence Built-in wireless transmission protocol, simple pairing, plug and play (TX is an abbreviation for Transmitter, RX for Receiver) With this product, you can easily enjoy big screen display, between TX (connect TV Box/ DVD/ Camera/ Laptop PC/PS, etc. video source device devices) and RX (connect TV/Monitor Projector etc. display devices) is wireless ransmission,without cables,save the cost and is more convenient and tidy. 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 good for protecting eyes Note: 1. The RX cannot be used alone,it should work with the TX, one TX can work with max. 2 RXs 2. Only when no obstruction,one-to-one transmission,can up to 30m,if 1TX to 2RX,within 10m 3.pls use it in barrier-free open space,do not use it to go through walls/floors.etc. Color: As Shown Material: plastic Package Contents: 1PCS Transmitter 1PCS Receiver 2PCS USB Power Cable 2PCS Cable 1PCS User Guide 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.