1. Light,Small and ultra-mini appearance,easy to use, easy to carry, very convenient; 2. video and audio transmission via built-in wireless transmission protocol,no need wifi or internet. 3. Plug and play, not need to install any driver and Apps. 4. 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. 5. Support mirror and extended modes. Product Name:Wireless Display Adapter Resolution:1080P Power Supply:5V/2A Band:5.8G Transmission Distance:outdoors open space can reach 50M,indoor without any barriers around 30M(Pls noted that this model does not support through the wall) Support one to one mode and many to one mode( up to 8 TXs to 1 RX) Noted:the model not support 1 transmitter to many receiver,it is support many transmitter to 1 receiver mode. Specification:Transmitter Colour:Black Material:ABS Package Contents: 1 * Wireless Transmitter 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.