It arrived in only 3 weeks after I ordered. Very fast shipping. There is a description about codec,it is Apt-x LL. Using my headphone branch cord,and checked the Latency comparing my wired headphone with the pair of this wireless transmitter and this receiver. If this item is real Apt-X LL,then latency must be only 40 msec, but using this Transmitter and Receiver,Latency is about 500 msec. And I checked sound quality by Monitor Headphone " AKG K240",and "audio-technica ATH-770COM",and using this Transmitter and Receiver ,but sound is not good.The sound is muffled,and bass sound is not pass through.like a 1 dollar earphone. It is not good for music.
It arrived in only 3 weeks after I ordered. Very fast shipping. There is a description about codec,it is Apt-x LL. Using my headphone branch cord,and checked the Latency comparing my wired headphone with the pair of this wireless transmitter and this receiver. If this item is real Apt-X LL,then latency must be only 40 msec, but using this Transmitter and Receiver,Latency is about 500 msec. And I checked sound quality by Monitor Headphone " AKG K240",and "audio-technica ATH-770COM",and using this Transmitter and Receiver ,but sound is not good.The sound is muffled,and bass sound is not pass through.like a 1 dollar earphone. It is not good for music.