Description : Size : 18.5 (L) x 6.2(W) x 2.8 (H) cm Projects horizontal or vertical laser light beam Locking 8-foot measuring tape. Standard and metric rulers Ideal For Any Job That Requires A Straight Line Or Accurate Measurement. Laser light has an on/off power switch. Laser max output: less than 0.5mW Powered by 3*AG13 button cell battery (included) Packet content: 1 X Level Laser 3 x AG 13 Button-Cells