The VOX AP2-BS is a compact wireless system for bass guitars, featuring a 1/4-inch jack connection. Earphones are also included. - Brand: VOX - Model: AP2-BS - Type: Wireless system for bass - Color: Black - Connection: 1/4-inch jack Thank you for viewing. VOX amPlug 2 Bass (AP2-BS) Small headphone amplifier for electric bass I bought this for practicing at home. I've used it a few times, but it's been stored at home for about 3 years, so it's been a long time.