From Meinl:

The MEINL Pickup Vertical Subwoofer Cajon with Baltic birch playing surface features forward projecting sound ports in place of the traditional rear-facing style and an internal reflex channel that helps develop the sound. When amplification is needed, inside the cajon is a Piezo pickup with tone and volume control on the outside. A quarter inch cable port allows you to send your signal through any amp or PA system.

Vertical forward-facing subwoofer sound ports.

Piezo pickup with volume and tone control.

Dual internal fixed snare wires.

Baltic Birch playing surface.

Brand New.