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For smartphones, tablets and computers: Works with devices that support wired headsets. Connect using the 3.5 mm headphone socket (audio jack) or the included active USB-C adapter. iPhone 7–14 require the Lightning bundle (sold separately). Check your phone connection before ordering: Use the headphone socket if your device has one. If not, use the included USB-C adapter. Devices with a Lightning port require the Lightning bundle from Opis Technology. Push connectors in fully: Plugs must be inserted completely for proper audio and microphone function. If you use a thick phone case, it may need to be removed so the plug can fully click into place. Wired connection – no setup required: No Bluetooth, batteries or apps. Simply plug in and start calling. If audio does not switch immediately, reconnect once or restart the phone. Classic telephone-style handset: Traditional proportions, solid weight and a coiled cable provide a comfortable and familiar way to handle calls at home, in the office or while travelling.