Powering Off: Press the switch for one second for power off. Low Battery Alarm: When the battery becomes lowwork voltage, the detector sound warning alarm.And check distance short.after warning alarm10 seconds.it turn off automatically.Replace the 9V battery as soon aspossible. 50Ft waterproof depth.LCD Screen display signal level. Components and Function: Powering On Press and release button while holding the detector away from any metallic objects. You hear 1 beep. Battery Replacement: Simply rotate battery covercounterclockwise to remove and clockwise to tighten by hand. To properly install the 9V battery, match the larger battery terminal to the larger opening in the compartment. Remove the battery when the unit is to be stored more than 30 days., Weight: 0.5621787681 pounds, Manufacturer: tiyao