The sound quality over the Greadio speaker is excellent and produces adequate volume to refill a medium sized room without any issues. You could take the speaker indoors or outdoors without any problems and In addition it works off using the micro SD memory card. The sound functionality that https://www.bluetoothspeaker.top/bluetooth-wireless-speaker-3d-stereo-surround-sound-stereo-audio-player-loudspeaker/