Working range 5m. Laser type 635nm. Levelling accuracy +/-1mm/m. Integrated spirit level function. 2 bubble levels for horizontal and vertical use. Laser measurement gives greater precision than standard ultrasound methods. Laser diode 653BNm. Laser class 2. Can be fixed to wall with pins, screws/nails, powerstrips or regular tape. Includes pins and powerstrips. Requires 2 x AAA batteries, included. Size (H)29.4, (W)11.6, (D)6.4cm. Manufacturer's 2 year guarantee excluding professional use.