Model 200308 Quantity 1 Color Black Material Aluminum alloy Laser color Green Laser Power 5 mW Wave Length 532 nm Battery Configuration 2 x AAA (2.4~3.0V / not included) Functions Easily to use only need to push the button then you can see striking blue-violet beam of light shoot forth; The light can point at any targets such as photos blackboard video monitors and so on; Best choice for teachers professors doctors and so on; Continuous output and working time of over 5000 hours. Packing List 1 x Laser pointer 5 x Replacement heads (Starry sky light beam random dots circle cupid)