Dual head 4000 lumen flashlight is a unique dual head rechargeable flashlight with aluminum body and high-definition optical PMMA lens. The two lamp caps are equipped with 6 CREE XP-G2 LEDs, powered by one 21700 Li-ion battery. The maximum output reaches an amazing 3800 lumens. DS40 has five lighting levels and flash modes such as strobe, SOS, beacon, etc. It is widely used in indoor, outdoor and other occasions.