The VOX Bass amplifier allows you to adjust volume and tone, and also features a headphone output. - Brand: VOX - Model: Bass - Features: Volume control, tone control, headphone output - Connector: 1/4 inch jack Thank you for looking. It runs on two AAA batteries. You can practice while listening through headphones when you can't play loudly at home. I am selling it because I purchased it but haven't had many opportunities to use it. *Please note that this is a used item, so those who are sensitive to such things should refrain from purchasing.