532MD-30 532nm 1mW 4.2-5VDC Green Laser Dot Diode Module with TTL Class 2 Wavelength: 532nm , Output Power: 30mw Working Voltage: 5V , Laser Shape: Dot Red wire for 5V+, Black wire for 5V-, Yellow wire TTL for 5V+,3 wires together, module will work normally Duty Cycle: 45 seconds ON, 15 seconds OFF Dimensions: 12mm X 60mm (including PCB)