A front and rear combination helmet light that now has been upgraded output to 400 lumens front and 50 lumens rear has the options of being either front rear or both. The link sits high above the traffic with 360 degree visibility and the power to be seen over a kilometer away. Prominent illumination whether commuting training or just riding day or night. In the boxlink plus daybright mk4 gmb helmet mount usb c charge cable qs guide. Red specification srp 100 output 400 lumens front 50 lumens rear weight 77grams burntime min 3 hrs max 32 hrs flash battery capacity 3500 mah li ion dimensions mm length 105 head 29 back ndash 27 led's 1x xpg3 1x xpe r hours runtime 3 32 hours fl lumens measured output 400 50 grams weight 77g leds 1 x white xpg3 x xpe red ip rating ip65 max lumens 400 50 battery 3500 mah li ion runtime 3 32 hours fl charging time 5 hours weight 77g material anodised 6063 aluminium length 106mm head diameter 28mm in the box link plus db mk4 helmet mount usb c charge cable qs guide 3 year warranty on all of our lights and the leds inside are covered by a lifetime guarantee! Ensuring peace of mind with every purchase. Our lights are designed to last a lifetime so we carry out servicing and repairs on lights well beyond the warranty period