Moon comet mk ii rear lightthe comet rear utilises cob technology to provide great visibility on your bike this rear light comes complete with seat post and saddle rail bracket for flexible mounting options features 1 pce cob high brightness led 30 lumen output internal li ion battery usb rechargeable 2 hour usb charge time full beam 3 hours low beam 7 hours flashing and constant modes low battery indicator auto charge cut off side visibility includes seat post and saddle mount brackets horizo