Small but brightthe flare is a super bright tiny rear light powered by either a disposable or rechargeable cr123 battery simply clip it onto your seat post for 75 lumens of red light just twist the head to turn on and off and switch between solid and pulsing modes exposure lights have always been designed to get the maximum light from minimum sized unit and cable free design ensures this is maintained utilising superb brackets exposure lights attach quickly safely and securely for hassle f