ASUS S1 Ultra-Portable LED Projector Mobile Power in One. A palm-sized projector weighing only 0.75lbs at a height of 1.18-inches, the ASUS S1 LED projector features a built-in rechargeable battery that provides up to 3 hours of projection time that can also be used to charge mobile devices over USB. The S1 has a 1.1:1 short-throw lens that projects a 41-inches diagonal image at a distance of one meter. Housed in an aluminum chassis with a sleek concentric-circle finish, and features an HDMI/MHL port, a USB port (for charging) and an ASUS SonicMaster-enhanced speaker, making the S1 the perfect sidekick for both professional and personal projection.