405nm Violet Blue Purple Laser Dot Diode Module 20mW 13mm x 42mm with US AC Power Adapter Wavelength:405nmOutput Power:20mw Working Voltage:3V-5.5VWorking Current &lt;180mA Laser Shape: DOT This violet/blue laser module with driver is an industrial electronic component and used for industrial testament, Lab etc. Please be careful when you are doing some test on it if there is no temperature control device.