Parameters Output Power 20mw Wavelength 405nm Working Voltage 3V-5V (red cord for postive +, white twine for destructive -) Working Current <55mA Working Temperature +10 ℃~+40 ℃ Laser Shape:DOT/ Line/Cross Focusable Yes Material and Color Metal Lens:Plastics Dimensions 13x42mm Features This 405nm laser diode is an advertisement digital ingredient and used for as Industrial testament, Lab, DIY. It is precise and sensitive optical instrument. Before sporting on some laser DIY activities, please examine the technical information first and keep your eyes earlier than laser ray. Be yes the operator has experience in optics DIY or testing. The laser module is awfully powerful, please upload heatsink on laser holder and wear laser defense goggles when engaged on this module! Package 1pcs Focusable 20mw 405nm Violet/Purple Blue Dot/Line/Cross Laser Diode Module 13x42mm 3V-5V