Modular buddy-jack design; Compact speaker delivers big sound from a 45mm full-range driver; Plays MP3s from the built-in microSD(TM)/microSDHC(TM) Card slot; FM radio tuner; Connects via Bluetooth(R) or 3.5mm aux cable; 5,000mAh rechargeable battery; Freq resp: 280Hz-16kHz; Includes USB cable & aux cable; Red;