Features: Build-in microphone, support telephone call and music listening. BT connection, 10m transmission distance, very convenient. BT intelligent memory function, automatically restore and restart BT speaker connections and equipment. Designed with memory card slot, capable for reading or playing music data. Play/pause (also answer/reject calls), vol +/- (next/previous track) worm wheel, super easy operation. Built-in lithium battery (charged via USB). Sand timer appearance, fashionable and stylish, can be used to decorate your home as well.