The crescent light comes with cob leds and is usb rechargeable ideal for the daily commute 1 piece cob 10 chips high brightness white led 50 lumens of light output rechargeable lithium polymer battery 37v 300mah usb rechargeable 5 modes standard high over drive 50 flashing 100 flashing strobe quick release rubber strap handle bar amp seat post mount fits 22 318mm quick release saddle rail mount low battery charging and fully charged indicator automatic fully charged cut o