This lightweight, battery operated bicycle safety light comes with everything you need to keep you safe while riding your bicycle. The safety light easily mounts to your bicycle seat post and bright LED display spells out the word BIKE which can be seen for over 200 yards away by oncoming vehicles.. Automatic left & right turn signals are built into the sign to offer extra protection. The safety light requires 8 AA batteries that are included and will give you up to 50 hours of usage. To safety light folds shut when not in use to save battery life.