Features: . Output Power 5mw Wavelength 532 nm Working Voltage 3 V Working Temperature +15 degrees~+35 degrees Duty Cycle 60 seconds ON, 15 seconds OFF Laser Shape DOT Focusable N/A Material and Color Brass Spring is Negative -, bronze casing is postive + Dimensions 12 mmX50mm(including PCB) with switch and spring on the PCB, can be used to DIY laser pointers