Very little use i would say less then 3 full hours of use. Very nice and clear images Overview Screen mobile content with this Miroir micro projector. It produces an image size of up to 50 inches for a large-screen HDTV-like appearance, and it has built-in speakers and a 3.5mm port for flexible audio setup. Connect a high-definition media source via the HDMI port and cable of this Miroir micro projector. Features Pocket design Weighs just 6.98 oz. for easy transport to meetings, presentations and more. DLP image technology Offers crisp visuals. 15 lumens of brightness Offer a highly visible display with clear on-screen images. 1,000:1 contrast ratio Provides a multitude of shades between black and white for rich color saturation. 640 x 360 resolution Provides crisp picture quality. HDMI input Makes it easy to connect to high-definition sources. Up to 50" viewable screen size Allows everyone in the room to enjoy a clear view. 2:1 throw ratio range Reproduces wide images in their correct proportions. Supports a variety of signals Including 1080p for a wide range of compatibility options. LED lamp Delivers up to 20,000 hours of lamp life in normal mode for extended use. Built-in 1W speakers Provide crisp sound. 2 hours battery life Usable in places with no access to power outlet. USB power out Allows you to charge your smartphone while projecting or power your HDMI streaming stick.