Petzl Swift RL

Lightweight but powerful, the Swift RL packs 900 lumens into a compact 100g package. Attractive and comfortable to wear with a reflective double band across the back of the head that stays put while you run. The headband also detaches so you can wash it. A single lockable button controls all the functions: on/off, lighting modes, and brightness. If you press the button long it will switch from Reactive lighting to Standard. In Reactive lighting the lamp light sensor automatically adjusts brightness and beam pattern, optimizing battery usage.

To charge the lithium battery plug it in via the micro USB port. It takes about 6 hours to fully charge and there is a 5-level indicator showing battery level.

Ouput: 900 lumens 
Weight:  100 g
Modes:  proximity, standard and distance, white only
Battery:  lithium ion rechargeable via Type B micro USB (included) 
Burn time:  up to 100 hrs (max autonomy), 2 hrs (max power)
Weather protection:  IPX4