The HDMI switching hub supports plug and play.No external power is required and can only be connected via HDMI cable. The HDMI switcher only needs to switch the signal, no external power supply, the input device must have power input to work properly.(Most playback devices with HDMI interface are connected to an external power supply and the HDMI output interface will have power). If the HDMI switcher does not work, please check whether your input device has external power and whether the use of the connection line meets the requirements of standard lines. The input and output cables of the HDMI input cable can be up to 5 meters long.No signal loss or data transfer problem even with long cables.The cable maintains a high bandwidth of 3.4 Gbps at all times. color as shown Size：5.2*4.85*2cm Weight：100g ● HDMI switching hub supports plug and play.No external power is required and can only be connected via HDMI cable.● HDMI switcher only needs to switch the signal, no external power supply, the input device must have power input to work properly.(Most playback devices with HDMI interface are connected to an external power supply and the HDMI output interface will have power).●If the HDMI switcher does not work, please check whether your input device has an external power supply and whether the use of the connection line meets the requirements of standard lines.●The input and output cables of the HDMI input cable can be up to 5 meters long.No signal loss or data transfer problem even with long cables.The cable maintains a high bandwidth of 3.4 Gbps at all times.●