A must own item for every Fibre Optic Technician.  Laser Output: 50 mW Laser Wavelength: 650 nm Laser Distance: up to 50 km Fiber Applications: singlemode / multimode Connectors: 1.25 mm connector (or) 2.5 mm universal connector Features: Continuous Wave and Pulsed Mode, constant output power Power: 2PCS AA batteries (not included) Shell Material: Aluminum Size: 17.5 x 2.6 cm