Brand N/A Quantity 1 piece(s) Color Black Function Handsfree Compatible Cellphone NO Phonebook Capacity 8 cell phones Bluetooth Version 3 Transmit Frequency 2402~2480MHz Transmt Distance 10 m MIC Effective Distance No SNR 90 dB THD N/A Frequency Response 2402~2480MHz Interface/Port Micro USB External Card Max. Support No Battery Capacity 600~650 mAh Other Features Bluetooth version: Bluetooth v3.0; With audio prompts; Bluetooth effective distance: Within 10m; Supports two cell phone connected at the same time (Maximum memory eight Bluetooth cell phones); Built-in DSP noise control and echo cancellation function; Equipped with high-fidelity speakers and high-sensitivity microphone; Lithium battery: 3.7V 600~650mAh. Packing List 1 x Bluetooth device 1 x Car charger adapter 1 x USB to micro USB cable (75cm) 1 x Chinese / English user manual 1 x Hex wrench