Instruct: Classify the given Amazon review as either positive or negative.
Query: For TV, it works fine, but only when it works

Bought this for my wife to use to watch TV when I'm asleep. Unfortunately, the device has no on or off switch - it is supposed to sense input and activate itself. However, either through the mini-jack or the RCA cables, that doesn't work reliably on our TV. The device often fails to activate itself (requiring a trip to the TV to pop the connector in and out) or, worse, turns itself off in mid-use, blasting your ears with static (since amplification is also weak, you need to have the volume way up on the headphones to get usable volume). It's also a pain to tune the signal with the dial - its extremely challenging to find the signal since it tunes for only the tiniest sliver of the dial's travel, and any twitch of your thumb loses it again.My wife has given up using it and is back to closed captions. Sigh.