And does not work when using Internet-based television or TV boxes that only allow their own recording techniques.

According to the manufacturer, a mini-jack connection is available. https://www.sony.ch/de/bravia/products/x80l-x81bl-series/spec

No, the Sony KD-43X80L TV does not have a 3.5 mm headphone audio out port for wired headphones or audio system connections. Instead, you can use alternative connections such as Bluetooth, HDMI with Audio Return Channel (ARC) or Enhanced Audio Return Channel (eARC), or a digital optical cable to connect audio devices.

Hi, Both devices have almost the same functions. The colour optimisation on the KD-43X80L is TRILUMINOS PRO™, Live Colour™ technology Contrast optimisation : Object-based HDR Remaster, Dynamic Contrast Enhancer PICTURE PROCESSOR : 4K HDR Processor X1™ With KD-43X75WL the colour optimisation is Live Colour™ technology Contrast optimisation : Dynamic Contrast Enhancer On our page you can make a detailed comparison between both models. Sony Europe

The manufacturer states that this range is suitable for Apple Airplay. Only the following Sony models support Airplay 2 https://www.sony.ch/de/electronics/support/televisions-projectors/articles/00206864

Hi, it has 50/60 Hz. If you are using an HDMI device that supports 8K or 4K 100/120 Hz video output, connect the Ultra High-Speed HDMI™ cable and follow the on-screen instructions to set the [HDMI Signal Format] of the HDMI IN connector. Support for 4K 100 Hz depends on your country/region. Sony Europe

If the supplier meets the deadline, the TV should be available again at the end of the month.