The Knog Blinder Mini Niner Rear Light. These surface mounted LEDs punch well above their weight, with the 20/11 lumens for front/rear getting you seen from over 500m away. Niner and Chippy have reflected faces for added safety, and Dot, vain as she is, has a faceplate for added style and comes in 4 colours. With a weight of only 15 grams the light uses its tool-less attachment to securely connect to handlebars and frames of 22-32+mm.  Knog Blinder Mini Niner Rear Light Features Dimensions: 46x43x30mm Weight: 15g Materials: UV-Resistant Industrial grade silicone, Polycarbonate Housing, Optical grade PMMA Lens, Hard-Anodised aluminium fascia. USB Rechargeable Lithium Polymer Battery (USB). This saves using about 600 AAA Alkaline batteries during the light's lifetime. LEDs: Efficient LEDs designed to provide maximum brightness level for up to 90% of the battery burn time for each mode. Rather than LED brightness deteriorating during your ride Battery: Rechargeable Lithium polymer battery via integrated USB plug. Peak brightness: Front: 20 Lumens, Rear: 11 Lumens 5 Light modes: 1. Steady, 2. Strobe Flash, 3. Fading Flash, 4. Lightning Flash, 5. Eco Flash. Run-time: Blinder MINI front models last 1.8-2.5 hours in Steady mode, 3.5-4 hours in Strobe Flash, 3-3.8 hours in Fading Flash, 3.5 hours in Lightning Flash and 10-11.5 hours in Eco Flash.  100% Waterproof: The Blinder MINI is IP67 Tested and 100% waterproof against all elements Beam angles (degrees): 20° (Dot), 90° (Niner), 120° (Chippy) Bar Diameters: Fits bars / posts 22-32mm+ and aero.