High Accuracy and ResolutionIt can measure the horizontal inclination 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 BuzzerThe digital level box has a sound alarm function, which can be customized to sound the alarm after tilting a few degrees. And 4 balance indicators can help judge whether it is level and tilted (which light is on means which direction is low). reading is easy to read and clear. There are also read, erase and data hold toggle functions.Wide UseThe digital protractor has 4-sided magnetic base, you can use the digital protractor in the following applications: interior decoration, areas of construction, plumbing, floors and stairs, woodwork.