Specifications:* Lighting source: R2 LED Light* Highest brightness (maximum flux): 100 lms -240 lms* Maximum range: 50m -100m* Light Material: Plastic* Stalls: 4-speed* Focus: No* Continuous lighting time: 2-3.5 hours* Time Life: 100，000 hours* Waterproof: Yes* Rechargeable: Yes* Color: Black* Net Weight: 100g* Light Size :about 6*5.5*2cm* Wristband Size: 22*2.4cm (L*W)* Battery: One Lithium-ion(Included)Package Include:* 1 x LED Wristligh(Include Wristband)* 1 x LED watch* 1 x Micro USB cable* 1 xWarranty card* 1 xColor box