A portable Bluetooth player controlled via smartphone (Bluetooth) or built-in buttons. A high-quality D/A converter enables playback of lossless files. The speaker features Bluetooth, FM radio, USB flash drive, microSD card, AUX, Microphone IN, and phone calls. Two 102mm mid-woofers and two 37mm tweeters provide exceptional sound quality. You can also adjust the bass and treble levels yourself. Multicolor RGB backlighting in several modes gives the device a unique design, but you can also turn it off if you prefer.