Universal Handsfree Bluetooth Speaker Phone car kit Full duplex. DSP: Noise suppression processor and built-in echo cancellation. Built-in rechargeable battery. Bluetooth V2.0+EDR, Class II Range up to 10 metres. Charging time approx 2-3 hours. Use time; Up to 4 hours. Standby time: Up to 30 days. Compatible with Bluetooth enabled mobile phones. Controls for volume and answer/hang-up button. Visor clip and 12V Charger.