There will be times that the LEFT ear will disconnect from the RIGHT or (primary) earbud. To get the Left ear to reconnect, make sure that the RIGHT earbud is on and emitting sound. Take the LEFT ear out of the charging case and put in ear. Press and hold down the power button on the LEFT ear bud for 5-8 seconds. You should hear the power on chime and then both ear buds should emit sound now.