1The maximum optical resolution supports full HD digital video ready, which is practical. 2And the projector supports external mobile hard disk, memory card, U disk, STB multimedia video decoding. 3Meanwhile, such home projector supports all format playback, while the maximum supported resolution is 1920 x 1080. 4Ultra high dynamic contrast ratio is up to 1000: 1, and RD-814 color is clear and bright, so that dark details and bright parts are presented together, making each frame more gorgeous. 5Household projector is made of materials in high quality, easy to use in the practical life.Item Type: Projector Material: Plastic. Power: 15W Power Supply: 12V 1.5A Original Resolution: 320 x 240 Support Maximum Resolution: 1920X1080 Contrast Ratio: 1000: 1 Lifespan: 20000 hours Built-in Speaker: Yes Display Size: 20 to 80 inch Aspect Ratio: 16: 9 and 4: 3 Throwing Distance: 0.9-2.6 m External Storage: Support memory card Battery Model: AAA (not included)1 x Projector1 x Instruction Manual1 x Power Supply1 x Audio Cable1 x Remote Control(without battery)Remote control battery is not included.