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Thank you for contacting Sony, Den. The KD-65X77L television does not have an RF connection for a headphone cable. For connecting audio devices, including headphones, this model provides several modern digital and analog alternatives: Digital Audio Out (Optical): This is the best connection for a dedicated soundbar or high-quality wired headphones. HDMI ARC/eARC: For a soundbar or A/V receiver, this port simplifies connection and control. Analog Audio: A 3.5mm headphone jack is available via the Video In port (which is a mini-jack port that can be used for composite video input). USB Ports (x2): These can be used for power or connecting a compatible USB. If you are using wireless headphones, the KD-65X77L supports Bluetooth connectivity. You can verify the connectivity and port details in the official specifications document linked below: https://www.sony.com/electronics/support/televisions-projectors-lcd-tvs-android-/kd-65x77l/specifications We appreciate your interest in Sony products, if you need further assistance, don't hesitate and reach us for support! You can find contact options on the link below: https://us.esupport.sony.com/support/s/support-contact?language=en_US&category=tv Best regards, Gus, Sony North America Customer Support
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