Model: BT610 - Quantity: 1 - Color: Black + Silver - Material: Plastic housing - Connector: USB - Cable length: 100cm - Bluetooth v2.1 + EDR - Working frequency range: ISM 2.4GHz~2.4GHz - Supports hands-free headset etc Bluetooth protocol - Supports two cell phones at the same time Max. memory 8 Bluetooth mobile phones (Unique technology supports dual cell phone connection and standby on-line at the same time) - Built-in DSP noise suppression and echo cancellation functions - High fidelity with 2W speaker and high sensitivity microphone - Packing list: - 1 x Dual-standby Bluetooth speakerphone - 1 x Car charger adapter (input voltage: DC 12~24V; Output voltage: DC 5V +/-5% Max 500mA) - 1 x BL-5B battery (3.7V / 600mAh) - 1 x Clip - 1 x Chinese / English user manual