Rechargeable BatteryCome with rechargeable battery, The battery can be fully charged in 3 hours by type-c input charging port, and the flashlight can be used for more than 15 hours when fully charged,It could also charge for your phone by output USB port.You can also use three AAA batteries with the battery expansion bracket and sleeve in the box instead of rechargeable batteries. 5 Main Light Modes and 4 Side Light Modes5 Main light modes:5000LM/2000LM/800LM/FLASH/SOS,4 side light modes:1000LM(Warm Light)/500LM(Warm Light)/Red Light/SOS Waterproof & Multi-FunctionFlashlight rechargeable is made of aviation grade aluminum alloy and sealed design, achieving IP45 waterproof and shatter-resistant. With multi-functional design: 1With USB output port, which can be used to charge electronic device. 2With battery expansion bracket, can be used for emergencies.