Philips Portable Wireless Bluetooth Bass Reflex Speaker, Black, SBT300BLK/37 Powerful sound supported by wireless music streaming via Bluetooth. Bass Reflex speakers deliver a powerful, deeper bass. And versatile AC power with AA battery options ensure easy playback anywhere. 3.5mm aux-in Port Available. Bass Reflex speakers deliver a powerful, deeper bass, A chamber behind the speaker driver that channels air to acoustically tuned vents built into the speaker give the bass notes a more punchy, realistic sound. Ideal for any smartphone, computer or portable device, Works with any Bluetooth-enabled devices. Includes 3.5mm audio cable and Versatile AC/DC power with AA battery options. (110-220V)