[MFI Certification] This line has an official identification number, which means it is compatible with iOS devices and will not be damaged. The product contains an intelligent chip, which can still be used after upgrading the system. [Audio function] This iphone jack is used for cars, headphones, speakers, amplifiers directly connected to iPhone/iPod/ iPad and compatible with 3.5mm jacks.[Compatible devices] This audio jack cable is suitable for all iOS devices with interfaces (iOS 10.3.1 or later). This car auxiliary line uses tinned copper conductors and internal multi-layer shielding to uce signal loss and ensure stable and fidelity sound transmission. Sampling rate up to 48KHz, giving you good sound quality. [Sturdy and durable] The nylon braided jacket is very strong and prevents damage and abrasion. The aluminum tip is heat and corrosion resistant, ensuring long life. The Lightning port and 3.5mm jack support up to 15,000 insertions and 15,000 bends, so you can easily plug and unplug the device. The iPhone aux cord is made of Flexible Cord Carbon Nylon + Aluminum Metal Housing material, make the audio cable to be more strong but flexible and easily survive everyday heavy usage. 100% durable to use. It's also light weight and convenient to take around. No worry about the winding, knot or kink.