Most Frequent Trouble Shooting Solutions are -
1) Please pair under battery mode, NOT connecting to power / audio;
2) From pairing mode, LED lights of both devices slow down at the same time indicates they are paired. If one left first, it means it is stolen by other device in the household. Pls turn others off and try again;
3) To confirm paired, plug the transmitter to your smart phone first and listen to music;
4) Make sure valid TV audio output with a wired earpiece.