KNOG BOOMER REAR LIGHT - WHITE W/RED LIGHT SPECIFICATIONS: manufacturer: KNOG model: BOOMER lumens: 7 visibility: 600m light quantity: 1 RED super bright LED requires: 2 AAA batteries (included) body/strap material: stretchy silicone strap - mounts almost anywhere dimensions: 68 x 50 x 34mm (claimed) max constant mode run time: 12 hours (claimed) max flash mode run time: 72 hours (claimed) body color: white weight: 53g condition: new in retail packaging FEATURES: 4 flash modes water resistant quick release mounting INCLUDES: 1 BOOMER rear tail light 1 quick release strap mount 2 AAA batteries Please note: Most of you will receive functioning, full or partially charged batteries. If your light is not working, be sure to pull batteries out and check to see if the manufacturer has placed a battery protecter between them. Batteries are something beyond our control, and as such, we will not warranty against dead batteries.