<https://24guitar.store/product/nux-stageman-ac-25-acoustic-guitar-amplifier-with-bluetooth/#product>
<http://schema.org/sku>
"4989"^^<http://www.w3.org/2001/XMLSchema#integer>
<https://24guitar.store/product/nux-stageman-ac-25-acoustic-guitar-amplifier-with-bluetooth/>