Duration 2-5 Hours 

Max Range 300-600m 

Impact Resistance 1m 

Water Resistance IP65 

LED Bulb 6 ×Cree XM-L T6/ U2 (LED with a lifespan of 100,000 hours) 

Battery Type 4400mAh (4 × 18650) 8.4V Li-ion Battery Pack 

Crust Materials T6061 Air Aluminum Alloy 

Switch Back Switch Size Headlamp: 7(Dia) × 6(L) × 6.7(H)cm/ Box: 24.5 × 22.5 × 6.5cm G.W 780g/set 

Packing Included

Battery Pack, Charger, 2pcs Rubber Ring, Headband and Common Box/ Gift Box Optional Contents

6000mAh / 8000mAh Battery Pack Web.

http://www.okadu.net/bike-light/led-bike-light/6-cree-led-bike-light.html