1. Signal indicator: When the device is recording video normally, the indicator lights up. 2. Power indicator: When the device is connected to the USB port of the computer, this indicator is lit. 3. HDMI input: The HDMI output source such as camera, camcorder, game box, IPTV box, etc. is connected to this slot. 4. USB3.0 output: You can connect the USB3.0 input of a computer or laptop to this slot.