3 connectivity and support for that aptX codec (on compatible devices) give a more stable connection and potentially higher audio quality for Android users. 6-inch tweeter and also a passive radiator fires sound out the entrance and it mirrored around the back again, bringing the driver count to 6 https://www.bluetoothspeaker.top/bluetooth-stereo-surround-subwoofer-speakers-audio-player-loudspeaker/