Ultra-small and ultra-high performance USB rechargeable: ultra-light and ultra-small, weighing 11 g, volume 2*4 cm. 250 lumens ultra-high brightness. Three lighting modes (flashing light) Ultra-long battery life 3-50 hours 250mAh lithium battery. Magnetic suction function, can be fixed anywhere, anti-drop and shockproof, 5 meters drop without damage. Comes with IPX7 silicone waterproof jacket. With key hanging hole, carry it with you Product specifications Rechargeable battery: 250mAh (charging time is about 1.5 hours) Battery: lithium-ion polymer battery Luminous color: 6000K white + red Luminous mode: red light flashing/weak light/strong light Body size: diameter 2 cm x height 4.2 cm Material: fully transparent PC plastic Battery life: strong light - about 3 hours light - about 30 hours/red light flashing - about 50 hours Waterproof specification: IPX7 (waterproof only when wearing a waterproof case) Packing list: multi-function light, manual, USB charging cable, waterproof case, iron plate with adhesive backing, spring key ring.