40m Laser Distance Meter Mini Infrared Rangefinder Distance Measuring Equipment USB Charging Item Type: Distance Meter Material: ABS Color: As shown in the picture Model: JQ-40 Power Supply: Rechargeable lithium battery 3.7V 200mAhx1 (built-in battery) Application: Industrial, building distance measurement Charging: USB interface charging Model JQ40 Measurement Accuracy +/-2mm Unit m/in/ft Measuring Range (without reflector) 0.05-40m Measure Time 0.1-3 seconds Laser Class Level II Laser Type 635nm <1mw Dustproof and Waterproof IP 54 Automatically turn off the laser 15 seconds Automatic Shut Down 45 seconds Illumination White LED Measurement Standard Switch √ Data Erasure √ Power Display √ Signal Strength Indicator √ Continuous Measurement (Maximum, Minimum) √ Add, Subtract (Distance, Area, Volume) √ Area, Volume, Pythagorean Function √