Description: This Bluetooth can noise reduction to answer, support any key to answer, and connet to smart phone, automatic matching connection program, charging to maintain the connection state. - Sound isolation, high-definition calling: Identify the sound frequency through the intelligent control chip, produce the reverse signal to filter out the external noise (noise and wind). Make HD calls in any noisy environment. Very beautiful sound quality gives you different enjoyment! Wireless Play: Removing troubles of wired connection, through the wireless connection and transmission, the user can enjoy a high fidelity music at any place indoor by wireless control. Portable Design: Mini size with clip design the feature of portable can let you carry them to anywhere you want. Compatible with home stereos / speaker, car stereos, headphones that is with 3.5mm audio input. Specification of conditions: Type: Bluetooth Audio Receiver Material: plastic Quantity: 1 pc Color of the item: black Bluetooth version: 4.1 Profile: A2DP Transmission range: up to 10 m / 33ft I / O 3.5mm female plug, Mini USB female port Power Supply: DC 5 V Charging time: around 30 min Working time: about 4 h Size: 1.4 * 1.5 * 5.8cm / 0.5 * 0.6 * 2.3(L * W * H) Package: 1 * Bluetooth audio receiver 1 * 3.5mm to 3.5mm adapter 1 * English user manual