[Designed for Bassists]: This mini amp is a silent amplifier specifically designed for bassists. It allows you to adjust the mix ratio of direct signal and speaker simulation signal, catering to your preference whether you like more of one signal or a balance of both. [Main Features]: The bass amp offers BASS signal amplification and cabinet simulation. It comes with three potentiometers for controlling Volume, Tone, and Mix, providing you with a customizable sound experience. [Headphone Output]: Mini amp with a headphone output interface, you can experience the powerful and stunning sound of a large bass speaker through your headphones. This feature allows you to practice privately without disturbing others. [Convenient and Versatile]: Headphone amplifier is easy to use and portable, allowing you to capture inspiration anytime, anywhere. When connected to a CD player or MP3, it can play accompaniment and your playing simultaneously, making your practice sessions more effective and enjoyable. [Quality Material]: Headphone amp made of durable ABS plastic, this mini speaker is built to last. It features a 3.5mm MP3 input plug and a 3.5mm headphone output plug, making it compatible with most audio devices. : JOYO MP3 input plug: 3.5mm Earphone output plug: 3.5mm Color: Black Material: ABS Power supply: Using 2 x AAA batteries (not included) Package Contents: 1 x Bass Amp Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.