1、Wide features: The HD Multimedia Interface switcher with 3-in and 1-out. With the featrues of 4K high-definition picture quality, no need for power supply, button switch, audio and video synchronization. 2、More convenient: Press the keys to switch between different input screens. There is no need to repeatedly plug and unplug between the three devices, which is more convenient for office entertainment. 3、Button design: Use the buttom to one-second cut, easily switch one of the three HD Multimedia Interface inputs, solving the problem that seems to be caused by plugging. 4、4K high-definition: The 4K high-definition for smooth and not stuttered, support HD 4K video output and backward compatible. 5、Audio and video synchronization: The switcher full supports for audio and video synchronization, with shocking sound quality, easy to enjoy HD lossless music. 6、 1 * HD Multimedia Interface Switch 1 * user manual Name: HD Multimedia Interface Switch Switch: key Chip: high-performance conversion chip Housing: ABS plastic Interface: HD Multimedia Interface standard interface Resolution: 4K HD, and backward compatible