Feature:1. Lithium battery is rechargeable2. High resolution and high accuracy, it can provide professional measurement3. Gyroscope function for easy angle measurement4. Vshaped protective cover for easy installation in corners or pipes5. Acoustic alarm with configurable angle range with 5pcs magnetic basesSpecification:Item Type: Digital ProtractorModel: DXL360SAccuracy: 0.5Resolution: 0.01Measuring Range:Single: 360Double: 40 Response Time: < 0.4 SecondBeep Sound: 60dB at 30cmWorking Temperature: 0 to 50Storage Temperature: -10 to 60User Interface: Monochrome Backlight LCDPower Supply: Rechargeable Lithium-Ion Battery, 3.7VPower Consumption:Standby: 10uAOperation: 20mA.Battery Life: 4000 HoursWorking Battery Life: 40 HoursMagnetic Base: Set on four feetPackage List:1 x Digital Protractor1 x Charger1 x USB Cable1 x User Manual