The Knog Blinder 4 has four super bright LEDs that pump out upto 80 Lumens of front light and 44-Lumens of rear light. Its optimized optics focus and directs a smooth beam pattern that makes the Blinder visible over 800 metres keeping you well seen. Front : 80 Lumens, Rear : 44 lumens, Dimensions : 42 x 42 x 62mm, Weight : 39g, Materials : Industrial Silicone Body with hard-anodised aluminium fascia. Battery : USB Rechargeable Lithium Polymer.