【Portable Design】Mini size (98*98*21.5mm) and SUPER lightweight. Easy to be put in bag and carried to wherever you like. Ideal for using at home, enjoying films with your families, or relaxing before sleep. Also perfect for parties or camping projection in appropriate environment (dark). 【Built-in Battery】The projector is equipped with an AC charger and a built-in rechargeable 3.7V/3400mAh battery. Built-in battery makes it to be used freely without having to search for electric plug. It can also be a backup battery for your mobile devices. 【HDMI & MHL Input Support】Plug and play, easy and convenient to use. With a HDMI cable, mini switching interface and MHL input supported function (extra gadget is needed), you can connect the projector to your laptop, tablet, camera, or smart phone. Enjoy a variety of entertaining resources from as many devices as you like.