The USB cable can be plugged into a USB wall outlet or a USB port on a computer for power. Micro USB power port - Connect the supplied Micro USB to USB charging cable to charge the projector's internal battery or provide the projector with power.HDMI input - Connect the HDMI cable to this port and a device that supports HDMI video output to project content.3.5mm Audio out port - (Optional) Can be used to connect an external speaker or headphones.Power indicator light - This light will illuminate red when the projector is connected to power to show that the battery is charging or receiving power.System indicator light - This light will illuminate briefly as the device starts up, and will also come on if the projector's battery power is getting low.Power switch - Slide power switch forward (toward the projection lens) to power the projector on.Volume down control - Decrease the volume output of the projector.Volume Up control - Increase the volume output of the projector.Focus wheel - Roll left or right to fine tune the image focus.
