Review on Sony C400 Wireless Behind-Neck Headphones - Black (WIC400/B): Unparalleled Sound and Comfort by Kelvin Understanding

Sound quality is good, battery life is excellent. Of course there will always be better sounding options, but for $50 they sound good and are loud enough with minimal distortion. The biggest advantage for them is the great battery life. I've been using them for two 8 hour days at above average volume and still have a charge left when they finally charge. For this price you won't find anything better.