Stereo headphone output preamp immersive music experience - supports TRRS in-ear or headphone microphone input, rock quietly! 180 rotating plug - a plug-in headphone amplifier specially designed for electric guitar. Rich simulation effects - comes with noise reduction function (enabled by default, does not support turning off noise reduction), you can adjust the tone you like according to your own needs. BT connection function - MINI-X has BT connection function, which can assist users to connect to BT to play accompaniment practice, which is convenient and quick, and can practice the piano quietly without disturbing others. Large-capacity battery, battery life up to 5 hours - practice the piano anytime, anywhere, and don't worry about the battery life of MINI-X outside. It can be used normally for five hours when fully . The machine has built-in BT mode, and it automatically enter BT mode when the power switch is turned on. After the machine is turned on, the BT indicator light continues to flash, indicating that no device has been matched with the machine. The BT indicator light is on, indicating that the device and the machine are successfully matched. If there is still no device matching after of the machine being turned on, the machine automatically turn off the BT mode, that is, the blue light on the far left go out. (This design can effectively prevent BT from being mistakenly connected by a third during use.) Colour:Black Material:ABS Package Contents: 1 * Guitar Headphone Amplifier 1 * Type C Cable 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.