The audio is not transferred instantly between bluetooth transmitting device and a bluetooth device that receives the signal. Therefore when I'm watching movies on my Android TV box the audio is not being synced to the video. The app that plays movies allow me to enter offset audio in milliseconds. I would like to know what value should I enter in order to have audio and video in sync. My current setup is Leelbox Android TV box that uses Bluetooth 4.0 and Fiio BTR1 Bluetooth amp. I also wonder whether the Bluetooth delay depends on the transmitting device, receiving device or both? Or there is a standard delay for Bluetooth 4.0 SBC and it is constant between all devices?