JAM Rewind Wireless Bluetooth Speaker, Portable, Dynamic Sound, Rechargeable Battery, Retro Design, Built-in Speakerphone, Works with iPhone, Android, Tablets, Cassette Design, HX-P540BL Blue 4-Speaker system for dynamic sound Rechargeable battery for up to 8 hours of playtime Bluetooth wireless functionality up to 30 feet, with speakerphone mode to switch from music to calls Perfectly portable: goes anywhere you go Voice prompts guide you through pairing and charging