Check the listing for details. Focusable 445nm Blue Brass Laser Module Survival Indicator Module 445T-2500. Condition: New. Listed at 160.94 USD. consumption reminder： This product is only used in various occasions such as wild survival and rescue instructions/scientific research/teaching laboratories/astronomical pointing stars and industry. Please do not buy it for non-professionals. Children and people who do not understand lasers are strictly prohibited to contact and use this product! Please wear protective glasses during use. Outer shell material: brass (good thermal conductivity)Internal laser module: copper (better heat conduction and longer service life of laser tubes)Power supply method: 14500Light emitting method: point-focused focusSwitch mode: tail button typeWaterproof and dustproof design for life, high anti-reflective and dustproof lenses, can be used in relatively harsh environments! The head is reserved with a star interface, which can be installed with star, laser sword, beam expander, etc. Short, portable, high-power, camping pocket bag and easy to carry. PACKAGE:1pcs Focusable 445nm Blue Brass Laser Module Survival Indicator Module 445T-2500 (excluding batteries）