The Bosch RM3 Professional Motorised Rotating Mount for aligning the laser lines and versatile mounting of the tool. Operable with Smartphone via Bluetooth® or RC 2 Professional remote control. Compatible with: GCL 2-50 C, GCL 2-50 CG, GLL 3-80 C and GLL 3-80 CG. Specifications: Power: 3 x AAA 1.5V LR03 Batteries (supplied) Weight: 0.5kg.