BEST Quality Assurance: Certified Mobile Care Kit that can Fulfill almost any mobile Purpose. 100% Comaptible Assurance with 180 Days Doorsteps Replacement Warranty on each product unit.Hopestar H11 Subwoofer Portable Wireless Bluetooth Speaker is high quality Bluetooth stereo speakers with enhanced bass sound and hands free calling design.Hopestar H11 Subwoofer Portable Wireless Bluetooth Speaker has perfect color follow one's inclinations and with enhanced bass sound. The hands free function makes it much more convenient to have a call and speak freely, especially when driving a car.It also intelligently support TF Calvin and USD a read and play. Two 8W strong drivers and passive radiator within the speaker provides high definition audio and clarity at any listening level. What's more, the compatible Bluetooth function such as mobile phones/tablet/notebook multimedia equipment, enables you enjoy music whatever you like.