iHome Portable Rechargeable Bluetooth Music Receiver with Speakerphone and Home Docking Station - Gray - Add wireless Bluetooth connectivity to any speaker system equipped with a 3.5mm line-in jack; Built-in rechargeable battery brings Bluetooth connectivity to your favorite headphones; Speakerphone and sport clip allows for easy calls on the go; Convenient home dock allows you to charge and play audio to your home speaker system without confusing connections; Charge via USB or included 100V -240 V universal AC adaptor.