These focusable or key switch Handheld green lasers are military grade laser power >350mw of pure force with a very bright beam that can reach up to 150 miles in darkness and emits a very bright beam at daylight with a maintained power that lasts longer than regular laser pointers. Designed with a tempered black aluminum barrel casing, these handheld green lasers can withstand extreme laser functionalities, may it be in the battle field or inside a laboratory. Utilizing revolutionary heat sink and cooling technology, these lasers are designed for continuous operation while significantly maintaining high output-power perfect for advanced laser experiments and applications.