The items concerned are referred to as the VYPYR X series of audio-frequency electric amplifiers, model numbers - VYPYR X1, VYPYR X2, and VYPYR X3. These audio-frequency electric amplifiers are for use with various musical instruments (i.e., electric, acoustic, and bass guitars). Each model of amplifier is a combination of preamp with digital effects, power amplifier, and speaker enclosed in a wooden cabinet. The VYPYR X2 and X3 can be remotely controlled via their on-board Bluetooth controller and a control application for iOS devices. They can also stream audio, essentially turning them into a powered Bluetooth speaker which can allow the user to play along to backing tracks
[1] Please importantly note that only the relevant portion of the related is displayed above. You may refer to the said customs ruling for the entire ruling explanation.
[1]. https://rulings.cbp.gov/ruling/N321626