Featuresr multifunctional design bluetooth v40 speaker power bank bike light bicycle bell phone bracketr connect bluetooth to your mobile phone for calling and playing musicr latest popular bluetooth speaker let you enjoy clear music without noise and distortionr with built in rechargeable 4400ma battery can be used as a power bankr double led lights with front and flashing light for choosing lighting distance up to 50mr support tf card for mp3 wma wav music playingr ho