Niigata Seiki Bevel Box Level (BB-180W)USE A precision angle measuring instrument for installing machines, molds and fixtures, for assembly and for setting reference standard MATERIAL Body ABS Base Aluminum with magnet on base FEATURES Radio system Bluetooth4. 1 communication distance within 10m Zero setting at desired position With backlight for easy reading in a dark place ON OFF switchable Display hold function Auto power off function after approx. 5 min.ON OFF switchable POWER One AAA