The double clutch usb headlamp is a dual-power dual-function dual-output headlamp that gives you the flexibility of using either a usb-rechargeable battery or 3 aaa alkaline batteries.It also lets you choose either a spot or a flood beam both with high and low mode.It's lightweight and long-running with a 60 degree tilting head.The tough polycarbonate construction features polycarbonate lens facecap on/off twists and c4 led bulb.Included is a usb cord adjustable elastic and hard hat straps and 120v ac wall adapter.Material: ThermoplasticType: Head LampOutput: 30/125 LumensBulb Type: C4 LEDBody Diameter: 2.4"Oal: 1.60"Weight: 4 ozBattery: Rechargeable LithiumProofs: Water Impact ResistantColor: BlackHead Diameter: 1.75"Rechargeable: YesFilter Color: WhiteSwitch Type: Twist HeadHazair: Yes