Boss KTN-GO2 Katana Go Headphone Amp

This is what Boss say about the Katana Go2:

Katana in Your Pocket
Compact, convenient, and packed with rich tone, the KATANA:GO is the ultimate companion for guitarists and bassists. This powerful headphone amplifier delivers authentic sound from the stage-quality Katana amp series directly to your instrument’s output jack, along with a range of wireless music streaming, sound editing, and learning tools through your smartphone. Advanced spatial technology provides an immersive 3D playing experience, while BOSS Tone Exchange opens up an endless library of sounds to explore any genre. Whether you're an aspiring musician or a seasoned pro, the KATANA:GO keeps your creativity flowing wherever you play.

• Personal headphone amp with premium guitar and bass tones from stage-class Katana amplifiers
• Guitar mode with 10 amp types and over 60 effects
• Bass mode with three amp types and over 60 effects
• Stage Feel function provides an immersive headphone experience with advanced BOSS spatial technology
• 30 user memories in each mode filled with ready-to-play sounds
• View memory names and the onboard tuner with the OLED display
• Wirelessly edit sounds and play along with music from your mobile device via Bluetooth®
• Companion BOSS Tone Studio app with powerful tools for sound editing, memory organization, and YouTube practice
• Download and share Livesets at BOSS Tone Exchange
• Supports import of Tone Setting data from Katana guitar and bass amplifiers
• Rechargeable battery with up to five hours of continuous runtime
• Record/playback tracks in music production software on a computer or mobile device* via a USB-C®
• Wireless external foot control via the optional EV-1-WL Wireless MIDI Expression Pedal and FS-1-WL Wireless Footswitch
• Optional CB-KTNGO carrying pouch for KATANA:GO, charging cable, and other accessories