1、Support Bluetooth noise reduction answering, any key answering and support smart phone connection, automatic pairing connection program, maintaining charging connection state. 2、Identify sound frequency by intelligent control chip and generate a reverse signal to filter out external noise (noise and wind) in non-human voice frequency range. To realize high definition calling in any noisy environment. 3、Bluetooth 4.1, high reduction of high quality music, and the signal is stable and not easy to disconnect in the complex interference environment. 4、Built-in antenna, support 10 meters barrier-free transmission distance. 5、Exquisite and compact appearance, made of good quality ABS material, durable and high temperature resistant. Powered by USB, energy-saving and long life time. Features: Support Bluetooth noise reduction answering, any key answering and support smart phone connection, automatic pairing connection program, maintaining charging connection state. Identify sound frequency by intelligent control chip and generate a reverse signal to filter out external noise (noise and wind) in non-human voice frequency range. To realize high definition calling in any noisy environment. Bluetooth 4.1, high reduction of high quality music, and the signal is stable and not easy to disconnect in the complex interference environment. Built-in antenna, support 10 meters barrier-free transmission distance. Exquisite and compact appearance, made of good quality ABS material, durable and high temperature resistant. Powered by USB, energy-saving and long life time. Comes with a spring clamp for easy carrying. Specification: Material: ABS Color: Black Bluetooth Version: Bluetooth 4.1 Function: Support 2 in 1, support connection with earphone, mobile phone, speaker, car Coming Phone Reporting Number: Support Voice Prompt: Support 2 in 1: Support Pairing Timeout Shutdown: Shutdown after pairing state lasts 5 minutes Low Voltage Warning: Remind when the voltage is lower than 3.2V, once every 5 seconds; turn off when lower than 3.1V Size: Approx. 6x1.5x1.5 cm/ 2.36x0.59x0.59 inch Packing List: 1 x Receiver 1 x 3.5mm Metal Head 1 x Data Cable 1 x User Manual