Level Laser Aligner Horizon Vertical Measuring Tape Features: 1) Projects horizontal or vertical laser light beam. 2) Locking 8-foot measuring tape. 3) Standard and metric rulers. 4) Laser light has an onoff power switch. 5) Ideal for any job that requires a straight line or accurate measurement such as hanging pictures, installing shelving, laying flooring, etc. Specifications: 1) Length Tape measure: Over 8 feet 250cm 2) Length of laser line: 20 ft 3) Length of Ruler Measurement: 15cm 4) Uses 3x AG13 batteries (included) 5) Laser output: less than 0.5mW 6) Size: 20 * 7 * 3cm 7) Weight: 220g * Application: 1) Hanging pictures, paintings or mirrors 2) Laying tiling, flooring or carpeting 3) Installing wallpaper or borders 4) Whenever you need to have straight, accurate line, measure the length Attention: 1) Never look into the bulb while laser is ON. 2) Laser light can be harmful if used improperly. 3) keep the laser level away from water, dust and sunlight.