For the best experience, we recommend connecting to one speaker through Bluetooth. However, industry-wide, for all Bluetooth devices, there will always be some latency (audio lag) when viewing videos, and the amount of the audio latency is specific to the video application and OS. The lowest latency, with a single speaker, is around 250 milliseconds. To most people, this is not a noticeable latency that negatively affects the video viewing experience.
We have been informed by some customers that there is a noticeable latency that negatively affects the video viewing experience when connecting the speaker to a 3.5mm auxiliary cable. We are actively working to identify a solution to this issue and will update our website FAQs, Google Play and Apple App stores.