Combination of compartments - The combination of Digital Laser Meter 40M and 5M Tape Measure, a self-locking measuring tape, a high-end inverted display in black and white, the results are more visible! Tape measure - Accuracy: 1.5 mm, bandwidth 17 mm, stretching length 5 m(metric). Flexible "One Key" back with magnet; Coated nylon lining, completely wear-resistant. Digital Laser Meter - Accuracy: 2mm; m / ft / in switchable; Continuous measurement, just move the device in the valid range to get the exact result. The double photosensitive aperture apparently improves the stability of the measurement. Class II Laser, two modes of operation make it more convenient for field applications. USB rechargeable - Built-in rechargeable lithium battery for longer life, maximum power state can be used continuously for 5 hours, USB rechargeable, can be recycled, saves battery life and worries. Other supported functions - 1. Manual calibration automatically adjusts the laser accuracy. 2. Toggle between the front and back references. 3. The laser turns off automatically after 30 seconds of inactivity. After 180 seconds (3 minutes) of inactivity, the screen turns off automatically to save energy.