Pericross Rechargeable Portable Wireless Bluetooth Speaker Cycling Bike Bicycle Speakers with Micro Sd Card and Aux Inputs Waterproof Dustproof Shockproof for Smart Phone and Tablet The first dual-magnet speaker sound, deep bass, the outbreak of the best sound quality sound quality with volume VIFA HIFI Bluetooth with voice calls, support for multiple music formats, with the drop resistance shock, anti-skid function, feel super good. Light and small very easy to install,Mini design, easy to carry Play music life up to 10 hours (50% of volume) Enjoy perfect sound anywhere anytime! Volume keys and key tone song separate design, more convenient operation.