The Bosch GCL 2-50 C Professional Combi Laser offers many smart functions for maximum efficiency. A Bluetooth-connection provides remote-control adjustments via a smartphone app. Compact and versatile, ideal for all levelling applications. It projects horizontal and vertical laser lines and two centred plumb points with optimal visibility. Dual Power Source, it can be operated both with 12 V Li-ion battery and with standard alkaline batteries for added flexibility. Supplied with: 4 x AA 1.5V LR6 Batteries.1 x AA1 Alkaline Battery Adaptor.1 x RM 2 Professional Rotating Mount.1 x Laser Target Plate.1 x Protective Bag. Specifications: Accuracy: ± 0.3mm/m.Plumb Point Accuracy: ±0.7 mm/m.Self-levelling Range: ±4 degree.Working Range: 20m.Working Range with Receiver: 50m.Max. Working Range of Laser Points: 10m.Laser Diode: 630 - 650 nm, < 1mW.Laser Class:2.Levelling Time:4 Seconds.Power Supply: 12V Li-ion (NOT supplied) or 4 x AA 1.5V LR6 Batteries (supplied).Operating Temperature: -10-50 degreeC.Storage Temperature:-20-70 degreeC.Dust and Splash Protection: IP54.Tripod Thread: 1/4in.Compatible Laser Receivers: LR 6 7.Weight: 0.6kg.