Indicates out-of-level condition,beep automatically if it isn't horizontally placed within 3 degrees;Pressing 'outdoor' button(key),the power of the laser lines can be doubled, brighter lines to work;Slope fuction and lock mode,can be used for any angle layout;Line accuracy:1/25in@ 32.8 feet; Up to 32.8 feet indoors;Power:3.7V Ni-MH Battery*1pcs or AC Adapter

• Kaitian KTM557E Green Auto Level Laser 5 Line Laser Levels with Laser Detector Receiver
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Kaitian KTM557E Green Auto Level Laser 5 Line Laser Levels with Laser Detector ReceiverKaitian Electronic Technology