I only use this as a transmitter. Easy reconnection after the first pairing. I only use one set of headphones at a time and they all have low latency so I can't say if this is an issue when using non-apt x LL headphones or two, which to my knowledge overrides the low latency scheme. When used with my TV and speakers on, there is no echo, but there is "stickiness" of sound. It's not a problem for me and my wife and I feel comfortable hearing all of this. I really wish it would send a louder volume signal to the headphones, but I don't know if that's the initial volume flag in the digital signal from my TV, or a flag assigned by the broadcaster, so don't hit the balls for that, though be aware. Loud enough with my more efficient headphones and at normal volume with my less efficient ones.
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