Laser light has an on/off power switch.
Laser max output:  less than 0.5mW
Laser wave length: 650nm-680nm

4 functions included :

-projects horizontal or vertical laser light beam

-With measuring tape, of 2.5m (inch.feet)

-15cm / 6inch rulers

-with level vial, for vertical , horizontal and 45 degree 

Power: 3*AG13 button cell battery

Size: 18.5 (L) x 6.2(W) x 2.8 (H) cm

Packaging size: 210*80*40mm

Package weight: 200g

Unit Type:lot (2 pieces/lot)

Package Weight:0.500kg (1.10lb.)

Package Size:20cm x 18cm x 7cm (7.87in x 7.09in x 2.76in)