These Model AW772 headphones work OK on a few TV channels most of the time, but they fail to pull in some channels altogether. Automatic tuning is very fast for a few channels, but very slow for others. They sometimes lock onto an unknown channel or other source. The sound is very loud on some channels and very low on others for a given volume setting. Manual tuning is not available although a tuning label appears next to a false knob. Moreover, the instruction manual addresses manual tuning, which apparently was intended for the Model 722, which does feature manual tuning. Batteries never seem to have a full charge or reach full voltage even after 24-hour charging.