Kinivo ZX100 Mini Portable Speaker with Rechargeable Battery and Enhanced Bass Resonator (Grey-Blue) ERCD  Expansive Resonator Construction Design to give the best low frequency output Compatibility: all iPods, iPhones, MP3 players, CD players, laptops with 3.5-mm audio socket. (Does not support Bluetooth) Full-bodied, 360-degree sound Ultra-portable compact size with long-lasting internal chargeable battery Modular design: connect Multiple Speakers for Maximum Sound