Features:
Power Requirement: 16340 
Wave Length:532nm 
Length:120mm 
Head Diameter: 2.8cm
Tail Diameter: 2.3cm
Color: black
Light source: 5 milliwatts red/green light 2 mm
Materials: damselfly brass, shell with high quality aluminum. Waterproof seismic.
Range; About 2000 meters
Work time: 10000hours
Luminous exitance: less than 2.0mm
Power: DC3V
Working temperature: -10 ~65 
Note: Ban eyes look straight into the light, avoid to cause damage, and even lead to blindness! 

Package included
1 x Green Laser sight 
1 x Switch button 
1 x Pressure Pad Switch
1 x Screw Driver 
Power Requirement: 1 x 16340 battery (included)