used to describe project and experimentation , teacher demonstration tool, semiconductor Three line laser light source for physical optics.
color: red , 3V , power: 5mW ×3
Your safety matters to us!
Only meet in public / crowded places such as metro stations and malls.
Never go alone to meet a buyer / seller, always take someone with you.
Check and inspect the product properly before purchasing it.
Never pay / transfer any money in advance before inspecting the product.