1080P Resolution Supported - This HDMI switch supports HDTV Deep Color, 1080P resolution (1920x1080P) and 3D video. 3 Port HDMI Switch - 3 HDMI IN ports and 1 HDMI OUT port, suitable for various HDMI devices. 3 HDMI source devices need to be connected and manually selected for playback to avoid constant plugging and unplugging. Plug and play - no additional power supply required. The HDMI switch will automatically draw power from the source device through the HDMI port. Operation guide: 1. Connect the signal host (such as: DVD, PS3, TV box, etc.) to the 3 input ports (HDMI cable not included). 2. Connect the hdmi switch to the display (tv or monitor), remember to set the source to HDMI. 3. Press the "Select" button to manually select the signal master. Recommendations: 1. This switcher is only suitable for displaying 3 signal hosts on one monitor. 2. This HDMI Switch 4K cannot switch automatically, only manually press the SELECT button. 3. For some devices, when only one input device is powered on, the HDMI Switch may not work due to insufficient power. At this point, try turning on two or all three input source devices. 4. If a high-quality video connection is required, it is recommended that the total length of the HDMI cable be 3M.