SubZero Rock Guitar Headphone Amplifier £14.99 https://www.gear4music.com/Guitar-and-Bass/SubZero-Rock-Guitar-Headphone-Amplifier/2RKU
•Rock Guitar Headphone Amplifier For Quiet Practice
•Variable Tone Control, From Crunchy Rhythms To High-Gain Lead Tones
•USB Charging - No Batteries Required
•Aux-In For Jamming Along With Backing Tracks And Songs