Latency is never zero with Bluetooth, but it shouldn’t be an issue with the AirFly Pro. The latency for this device is generally 30 milliseconds or so, which should not be discernable while watching a movie or listening to music.
However, if the 3.5mm audio jack on the source device is a bit overpowered, it can cause longer (noticeable) latency. This is most common in devices such as musical equipment (amps, electric guitars, et cetera), but can happen with any audio port.
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