Duration 2-6Hours 

Max Range 300-500m 

Impact Resistance 1m 

Water Resistance IP67 

LED Bulb 3 ×Cree XM-L T6/ U2 (LED with a lifespan of 100,000 hours) 

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

ABS+ Aluminum Alloy 

Switch Back Switch( On/Off) Size 20.5(L) × 18 (W) × 6 (H)cm G.W 704g /set (Included Battery) 

Packaging Common Box, Gift Box Packing Includes

Headlamp. Battery Pack, Charger, Headband, Rubber ring and Gift Box Web.

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