Warm Tips: The RX cannot be used alone, it must be used with a TX. You can buy up to 4 RXs to use with 1 TX. Can't go through walls or any barriers, use in a barrier-free open space. With the increase of RXs, or the barriers, the wireless transmission distance will be shortened. Introduction: Our product is an imported chip and upgraded antenna version, supporting longer transmission distance and more stable. Brand new and high quality, buy with confidence. Features: HDMI video and audio transmission via built-in wireless transmission protocol, no need for WiFi or internet. HDMI 1.3, HDCP1.2 compatible. Support regular HD video resolution up to 1920x1080@60Hz. The transfer is efficient to ensure playback fluency. Built-in automatic balance system, the picture is fluent, clear and stable. Built-in ESD electrostatic protection circuit, comprehensive security protection system. Simple and convenient installation, plug and play, do not need to set up. Package Content: For the option of 'Only 1 RX/TX', it comes with the accessories of 1 RX or 1 TX, not the whole set. For the option of '1 TX and 1 RX', it comes with 1 HDMI Transmitter, 1 HDMI Receiver, 2 HDMI Extension Cables, 2 USB Power Cables, and 1 User Manual.