We say:

The Boss Waza-Air headphones is an all-in-one personal guitar amp system that gives you and your students stunning, realistic amp tones straight to your ears. There is no need to use a traditional amplifier with these headphones. 

You plug the wireless adapter, into your guitar, connect to your phone via the Tone Studio app, and then access a huge selection of Boss' legendary guitar tones and effects. These include new features such as Gyro Ambience add real-time surround sound, with authentic ambience settings for studio and stage.  The Boss Waza-Air headphones system is the ultimate silent-rehearsal electric guitar solution.

Boss say: 

Fusing premium amp and effect tones with breakthrough BOSS spatial technology, the revolutionary Waza-Air takes the guitar experience where it’s never gone before. This personal amplifier system brings stunning realism to playing with headphones, using a gyro sensor and moving 3D space to deliver natural “amp-in-room” tone that’s rich, resonant, and infinitely inspiring.

All-wireless connectivity means there are no cables to slow you down, and you can stream music from your phone and play as if you’re performing on stage in a full band. And with the BOSS Tone Studio app, you’re able to craft custom sounds with five amp types and over 50 different effects.