Is my iPhone 7 Headphones adaptor compatible with other Headphones ?
We’ll my iPhone 7 headphones adapter will not work with any kind of headphones
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Search for accessories that have completed MFi certification
Once an accessory has completed MFi certification requirements and is reported to Apple as sold/distributed, it will be searchable in our public database of authorized Lightning, headset, charging, iAP-enabled, and Find My network-enabled accessories.
https://mfi.apple.com/account/accessory-search
Learn how to identify counterfeit or uncertified Lightning-based accessories.