Instruct: Classify an Amazon review as either positive or negative.
Query: Great product . . . in 1979!

These wireless headphones are darn near the "junk" cateogry. They do work a little bit but not very well. Would have been great 30 years ago. These are possibly defective. The box looked great. The instructions were fine. The power supply plug was a bit difficult to insert and difficult to manipulate. I could tune in 1 channel just fine, but it it was impossible to get enough amplitude when I tuned in both ears. I will try a different brand next time.Luckily it's easy to return items to Amazon.