Sealegend D2 Mini Projector HD 3000 Lumens Support Full HD 1080P with WiFi Bluetooth Built-in Battery 8000mAh Android OS HDMI USB SD Card Slot Portable for Home and Travel, Black Mini Size, Portable ProjectorThis D2 projector is 3000 lumens, 1280x720 native resolution, supports 1080P Full HD; DLP technology, LED lamp; Built-in WiFi (2.4G), Bluetooth 4.0, 8000mAh battery and 2 speakers. Item size: 6.9*4*1 inches, weights only 1lb, compact and easy to travel with. Easy Operation, Large Screen this led projector has automatic keystone correction and digital focusing; can be operated by remote control or mouse. Maximun image size: 200 inches (18ft away from the wall). Android 4.4 System can install lots of APPs (Video, Game, Excel ,PowerPoint and so on). RAM/ROM:1G/8GB+Micro SD Slot. Good for Home and Office use. Multiple ConnectivityWireless screening mirroring by Airplay/Miracast/ Happycast, you can stream resources from smartphones, tablets and notebooks to a large screen. Connect with PC/ laptop/ TV box/ Fire TV stick/ DVD Player/ External speaker via HDMI/USB/SD slot/Bluetooth. Long Lamp LifeLED lamp can last 30,000. Even runs 40 hours per week, it can work over 15 years in average. We offer 30-day unconditional return and refund, 1 year warranty. Should you have any problem, please feel free to contact us directly: BoxLegend Offcial &gt; Ask a question . FQARemote control does not work? Answer: Probably caused by wrong battery installation. Correct method: push the battery into the middle wire slot and then close the cover. If the indicator is red when you press the power button, battery is correctly installed.