Plugs directly into your vehicle"s MP3/AUX input to allow handsfree phone conversations to play through your speakers 2.1 Bluetooth compliant support profiles: HFP DPS echo cancellation ensures a crystal clear conversation even in noisy vehicles; includes switching audio splitter AUX extension cable USB charging cable and car charger Rechargeable Lithium-Ion battery provides 5 hours of talk time and 24 hours of standby