Features: Output Power: 1mw Wavelength: 532 nm Working Voltage: 3V Working Temperature: +15 degrees~+35 degrees Duty Cycle: 30 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