High Precision and ResolutionIt can measure the horizontal tilt of the horizontal plane (X axis) and the vertical plane (Y axis) at the same time: single axis: 360, dual axis: 60, resolution 0 .02, accuracy 0.02. Rechargeable3.7V 1200mAh rechargeable Li-Ion battery. Connect the USB cable to the digital protractor and computer USB port to charge. It is very convenient to use. Sound Buzzer The digital level box has a sound alarm function, which can be customized to sound the alarm after a few degrees of tilt. And 4 balance indicators can help judge whether it is level and tilted (which light is on means which direction is low). LCD DisplayThe angle finder is designed with a Monochrome LCD screen, backlit, and the reading is easy to read and clear. There are also read toggle, erase and data hold functions. Wide Use The digital protractor has a 4-sided magnetic base, you can use the digital protractor in applications following: interior decoration, construction areas, plumbing, floors and stairs, woodwork.