Featuresr with 4pcs super bright leds provide more visibility and improve safety for your night ridingr three lighting modes high brightness 4hrs run time low brightness 6hrs run time flashing 8hrs run timer usb rechargeable bike taillight simply charge the bicycle light from your computer or any device with a usb port only takes 3 hours to fully charger lamp shell made of high strength abs material anti scratch and durable to user compact in size light weight ipx5 water resi