Call Noise Reduction Automatically turning on when you answer an incoming call, our headphone system detects and analyzes ambient noise through multiple microphones to accurately calculate the user's speech direction, with the goal of preserving clear speech and eliminating background noise for intelligent noise cancellation. Hi-Fi stereoHigh-fidelity sound quality, covering a wide frequency range, from bass to treble is very clear, restoring the details of the sound to the greatest extent, leaving users with a good experience. Bluetooth Connection and TF Card: The neck strap Bluetooth earbuds support TF card, which can not only wirelessly connect to the phone, but also insert the TF card into the card slot. Double click the "C" button to switch to the TF card. Save your favorite songs in your card and listen to them without the need for connect phone. 120 Hours Playback TimeThe product is equipped with a lithium-ion large-capacity battery and a low-