feature of product:<br> High-performance version Bluetooth chip V5.0+EDR, stable output performance<br> Omni-directional microphone design, calls are as clear as face-to-face.<br> Full voice broadcast, never miss any calls<br> Automatic switch machine, labor-saving and worry-free<br> Apple Siri voice control<br> 550mAh battery, 500 hours of battery life<br> Continuous talk time about 10 hours<br> Built-in digital amplifier greatly enhances volume and sound effects<br> Advanced multi-point connection, support two mobile phones online at the same time<br> Built-in DSP noise suppression and echo cancellation (CVC8.0 dual noise reduction technology)<br> Bluetooth transmission distance: 10M<br> Speaker: 42W, high-definition stereo<br> Accessories: car charger, USB cable, metal back clip<br> Packing list: 1pcs