This thing has a USB charger.
Little portable projectors aren't entirely new, but Asus is putting its own spin on things with the S1 Mobile LED Projector. It measures 3 cm (1.18 in) tall and weighs 342 g (0.75 lbs).
The S1 is able to throw a 41-inch diagonal projection just one meter away from the screen. Asus says that its long-life LED gives the projector the ability to instantly power on, so there's no waiting for warm up.
The S1 includes an HDMI/MHL port that allows users to project images and charge the connected mobile device at the same time, while the integrated speaker employs exclusive "SonicMaster" technology to provide audio playback.
It packs a built-in battery that lasts for up to three hours on a single charge, and a neat side feature that the cell also doubles as a USB battery pack for smartphone and tablet devices.