Nite Ize Helmet Marker Plus, Red Man-Made Materials Enter your model number above to make sure this fits. Lifetime spotlight white LED bulb Recessed LED bulb for exceptional durability, and the added benefit of focusing the light beam Bright Red LED Illumination-Glow/Flash Modes Passive High Visibility Reflective Pattern 1 x 2032 3V lithium battery included 75 hr. battery life Lightweight, flexible design; Easy to attach and remove - no tools required Features strong hook & loop fastener to attach to nearly any helmet & Gear Tie Reusable Rubber Twist Tie for additional attachment options Gear Tie - UV resistant - will not be damaged or destroyed by extended sun exposure -Won't scratch or mark -Twist it, tie it, reuse it Product Dimensions: 93mm x 54mm x 10mm | 3.7 x 2.1 x .4 inches; Product Weight: 20g | .7oz