... and echo cancellation. Sun visor clip design, support bluetooth headset, hands free. * Full Duplex Sound Quality* ... 2 * Supports Bluetooth Headset and Hands-free Profile(HFP 1.5)* RF Frequency Range: 2.402-2.480GHZ, 2 ... * 4 Button design: MFB, VOL+, VOL-, Mute,* LED Indicator Status : Blue, Red* Rechargeable 750mAh Li-Polymer ... 20 oC - 80oC Bluetooth handfree speakerphone/Bluetooth hand-free car kit