ROCKBROS Multi Function Bicycle Phone Holder Bike Light bluetooth Audio Powerbank Cycling Ring BellSpecification Brand ROCKBROSColor GreenBlackMaterial ABSNet weight 280gbluetooth distance10mLighting distanc50mCharging voltage current 5 0V 1 5ASize One size Suitable for mobile phone of 50 86mm wide almost all kinds of mobile phones in the market Features bluetooth V4 0 Speaker Power Bank Bike Light Bicycle Bell Iphone Bracket Waterproof Dustproof Anti scratch Shockproof High temperature Resistant Speaker Stylish and exquisite appearance which is convenient to carry With it you can enjoy music anytime and anywhere Excellent for Outdoor Sport and exercise and Travel Used as 4400MAH power bank can charge your phone or other device in emergency Double LED Lights with front and flashing light for choosing bluetooth connect to mobile phone for calling and playing music Support AUX input Support TF Card for play mp3 wma wav music Application of mobile phone andriod or IOS software Honking as the bicycle bell ir alarm to remind the front vehicles or passerby IP54 waterproof 32bit ARM master platform design and USB software upgrade Note 1 Do not soak in water It only support water mist proof 2 The holder is upgraded version more safety and firmly 3 The frist charge time is 6 hours then each time is 5 hours one charge can use about 18 hours 4 If you do not use it for a long time we suggest you to charge it one time each month to make sure it can work