DIY electronics and laser project folks, this is a cool little module! It's a 650 nanometer (deep red) laser diode with 250 milliwatts of output power. The focus is adjustable - you can twist the lens to make a tight dot or a wider line. Input power is 3 to 5 volts DC, so it's easy to run from a USB port, battery pack, or standard power supply. Brand new from LUNYEE brand, made in China. Listed under \Family Medicine\ for intended use, but let's be real - this is for makers, hobbyists, and project builders. Perfect for: laser pointers (be responsible!), laser light shows, alignment tools, DIY engraving setups (lower power), science experiments, or custom lighting effects. 250mW is quite visible and bright, but please remember laser safety - don't point at people, animals, or aircraft! Always wear appropriate safety glasses. This is just the module - you'll need to provide power and maybe a heatsink for longer use. Endless fun for the right project!