Features:- Specially designed with USB power port、 perfect to be used with power bank、 enables you to totally get rid of carrying the cumbersome battery- Adopts the circuit of CREE XM-L T6 LED whose output brightness can up to 800LM & There are 3 different lighting modes for your option- Durable aluminum alloy crust、 abrasion resistance & Equipped with 2X elastic rubber rings for your easy installation - Suitable for various kinds of outdoor activities、 such as cycling、 climbing、 fishing、 hunting、 camping and other outdoor activities Item Type: Headlamp & bicycle lightLED: CREE XM-L T6Luminous Flux: 800LMLED Quantity: 1pcsLight Color: WhitePort: 1 x USB 2.0 maleWorking Voltage: DC 3 ~ 20VModes: Strong / Weak / FlashButton Function: Mode selecting & OffHousing: Aluminum alloyColor: Black & SilverHeadlamp Weight: 100gPackage Weight: 128gUSB Cable Length: 55cmHeadlamp Dimensions (L x Dia): 55 x 42mmAccessories:2 x Rubber Ring