Sporting an aggressive design and the most powerful single LED tail light available, the Cygolite Hotshot Pro 200C is engineered from the ground up to stand out the brightest of daytime hours and at night with intense 200 lumen flashes. The exclusive 2 button design lets you fully adjust the tempo of each flash mode to maximize motorist awareness.Battery: 1, 762836A Lithium Ion, 3.7(V), 3.07(Wh), 19g, Included200 Lumens flashingUSB rechargableLight mode memory saves the mode you're in before the light is turned offIncludes flexible seat post mount2 - 210 hours run time over 6 modesItem SpecificationsBatteryLi IonLumens Rear200Recharge TypeUSBWeight59 CygoLite Hotshot Pro 200 Taillight Taillight UPC: 745025086157