This bike tail light kit with adjustable brightness and easy installation is perfect for outdoor riding use.<br/>Features:<br />Offers 3 lighting modes,including Always-on mode,Fast flashing mode and Slow flashing mode.<br />Maximizes 10 lumen brightness and lighting distance reaches to 400-500 meters.<br />180° large flood allows you to see wider and further areas during nighttime cycling.<br />Built-in a 180mAh battery recharges from your power bank,plug or any device with a USB port.<br />IP65 water resistant offers convenience during rainy days.<br />Provided fastener strap and buckle,convenient to fix the light on the handlebars,helmets,seat posts or backpacks etc.<br/>Specification:<br />Material: PC&#43; 6063 Aluminum alloy<br />LED: 16 pcs<br />Bright: 10 lumen<br />Water resistance: IP 65<br />Charging time: Around 2hr<br />Working time: 3h(Always-on Mode) / 9h(Slow Flashing Mode) / 56h(Fast Flashing Mode)<br />Battery: 1* 3.7v 180mAh 602025 polymer lithium battery (included)<br />Light size: 40 * 22 mm / 1.6 * 0.9 in<br />Light weight: Approx. 21 g / 0.7 oz<br />Package weight: Approx. 43.3 g / 1.5 oz<br/>Package List:<br />1* Bike Light <br />1* Charging Cable<br />1* Fastener Strap<br />1* Buckle<br/>NOTE: Please do not soak into water for long time.