Vcall Portable Wireless Stereo Large Bluetooth Speaker with Enhanced HiFi Bass,long battery Life,Built-in Mic Support Hands-free Phone Calls for iPhone, iPad, Tablet and More - Green The adoption of 7W HiFi bass speaker with unique 360 adjustable gear button design brings you extraordinary entertaining experience and great sound performance Quicker response and longer connection distance thanks to an upgraded Bluetooth chip processor. Enviromental-friendly and high-capacity battery avoid any frequent charging hassle Support wireless hands-free phone calls with up to 15 meters connection distance. Fully compatible with nearly all Bluetooth-enabled digital devices. Attractive transformers appearance with anti-skid mat attached to the bottom of the speaker to add stability Can be used for Class Teaching, Regular Meeting, Gathering Parties, Fighting Games or any other related occasions. Up to 7 hours working time