The bicycle tail light has 5 modes: Standard, over drive, 50% Flashing, 100% Flashing and Strobe. It’s a high Brightness LED Light which comes with a USB Cable. A Quick release handlebar mount is fit for 12-32 mm. It has rechargeable lithium polymer battery( 3.7 V 500 Mah). It can be fixed horizontally and vertically as well. It has low battery, fully charged and charging light indicator with automatically fully charged cut off system. It is water resistant.