Red beam multi line laser level (4V1H1D) Lens type: Single glass lens Output Power: <5mw Wavelength: Line Beam:635nm   Plumb dot:650nm Accuracy: ±1.0mm/5M Angle of projection: Vertical>120°    Horizontal>100° Self-leveling range: ±3° Function: 1 Horizontal Beam, 4 Vertical Beam, and Down dot Power Supply: 4AA Batteries Duration: 20 hours for single line Base: Rotary aluminum alloy base, with adjustable knob for line RANGE OF APPLICATION: Suspended ceiling construction. Partition construction. Installation of electricity, air-conditioner and water pipes. Marble and floorboard paving. OA-related office decoration and measuring-related work where leveling and plumbing is needed.