Boomphones Bluetooth Pocket Speaker for iPhones/Android (Black/Green) At 22mm thin, its small enough to fit in any pocket but loud enough to fill the room. With pairing mode, wirelessly pair two pocket speakers to one device for double the sound. Charge each Pocket Speaker using a patented hybrid USB/3.5 mm cable. Built-in Mic for phone conversations. Speakers on both faces of the speaker allow for 360-degree sound.