This bike tail light kit with adjustable brightness and easy installation is perfect for outdoor riding use.,Features:,Offers 3 lighting modes,including Always-on mode,Fast flashing mode and Slow flashing mode.,Maximizes 10 lumen brightness and lighting distance reaches to 400-500 meters.,180° large flood allows you to see wider and further areas during nighttime cycling.,Built-in a 180mAh battery recharges from your power bank,plug or any device with a USB port.,IP65 water resistant offers convenience during rainy days.,Provided fastener strap and buckle,convenient to fix the light on the handlebars,helmets,seat posts or backpacks etc.,Specification:,Material: PC+ 6063 Aluminum alloy,LED: 16 pcs,Bright: 10 lumen,Water resistance: IP 65,Charging time: Around 2hr,Working time: 3h(Always-on Mode) / 9h(Slow Flashing Mode) / 56h(Fast Flashing Mode),Battery: 1* 3.7v 180mAh 602025 polymer lithium battery (included),Light size: 40 * 22 mm / 1.6 * 0.9 in,Light weight: Approx. 21 g / 0.7 oz,Package weight: Approx. 43.3 g / 1.5 oz,1* Bike Light ,1* Charging Cable,1* Fastener Strap,1* Buckle,NOTE: Please do not soak into water for long time.