Does it have a built-in battery? Nebula P1 does not have a built-in battery and needs to be plugged in to operate. It is compatible with portable power banks providing an output of 100W or higher. For convenience, you can purchase Nebula P1 and Anker 737 Power Bank bundle on Amazon. How do I connect the speakers to the projector,or what can I do if encounter connection issue? Go to Settings > Remotes & Accessories > Pair More Official Accessories > Soundcore Surround Speaker.Press the Power button on the speaker 5 times until the light flashes blue. Select Continue, choose the speaker, and wait for "Speaker Connected." How can I get better screen brightness? Brightness decreases as projection distance increases. Placing the projector 5.2-7 ft away in dim light, 8.7-3.1 ft away in a dark room, and only use 15.8 ft in a completely dark room, and in daytime use, a 60-inch image at 5.2-7 ft is recommended. Why is there a gray border around the image? The gray border is a normal characteristic of DLP projectors caused by the inactive edge of the DMD chip; it is not a defect. To minimize the border, keep the projector level and aligned with the screen, and reduce or turn off keystone correction. Why does the Google TV home screen update or refresh while using the projector? This is caused by Google Mobile Services updating in the background and typically does not indicate a device malfunction. Keep the projector connected to the internet, and it should automatically return to normal once the update is complete.