Ingratiated brake sensing techniques. COB LED. Full 6061 Aluminium alloy chassis. Automatically turn on/off depending on the light intensity and motion. Automatically switch to sleep mode to save power. Two types of mounting kits can buy (cushion mounting / seat tube mounting). 6 flash modes. 500mAh Li-ion re-chargeable battery. Longer use time, 30% higher than the old model ,up to 32H. (slow flash mode) USB charging. Charge stage indicate. Compact and Light weight design (48g). IPx6 Water proof. Auto/Manual mode switch*. Note: *Manual mode need to switch on/off the light manually. Specifications: Auto/Manual mode switch*. Note: *Manual mode need to switch on/off the light manually. Working principle Manual mode: manual control switch with brake sensing function; Auto mode: light sensor, vibration sensor, brake sensor. In automatic mode,the tail light is off and there is still a brake sensing function. Package Included: taillight*1 USB cable*1 Bracket*1 Notes: Please check the detail size/model information before purchasing. Due to the different monitor and light effect , the actual color of the item might be slightly different from the color showed on the pictures . Thanks for your understanding. Please allow 1-2 cmmeasuring deviation due to manual measurement. Chat with us should you need any assistance.