The 3rd generation iGAGING AngleCube is rechargeable using a micro USB port (cable included) and has an auto shut off. The AngleCube is a precision instrument used for measuring angles in which any of its outer surfaces may be utilized. Zero can be set at any angle so that the relative angle between two surfaces can be measured. The AngleCube can also measure absolute level, you can also utilize it as a portable pocket level. This small device is great for setup or checking angles. It is accurate and reliable, and with three sides hosting strong magnets, it is easy to check angles on a work piece, angle vise, sine vise, worktable, or other shop operation. Hosting a large backlit crystal LCD display, the values are easy to read. The body is anodized alloy, and the devise is IP54 Dust and Moisture level protected. And the small size (approximately 2" x 2" x 1") makes it easy to fit into a pocket or apron pouch; and for use in tight spaces. The cubes accuracy is ±0.2 degrees with a resolution of 0.05 degrees at a range of 0-90 degrees. The cube comes with a convenient storage pouch. Use this cube for all types of setup work by placing it on tables, guards, even cutting blades.