Guitar headphone amplifier: Fender Mustang Micro Plus I haven't used it much, so it's in good condition. Operation confirmed. Sound output is no problem. The box, manual, and all accessories are included, but the flap of the box is torn. Specs: ■MustangTM series ■Digital amplifier ■Control Panel: Buttons: Preset (-/+), EQ (-/+), Effects (-/+), Modify (-/+), Tap Tuner, Save; Master Volume ■Input: Built-in 1/4" plug ■Headphone jack: 1/8" stereo ■Headphone Impedance Gain, Volume, Voice, Treble, Bass, Modify, FX Select ■Operating range: 16Ω or more ■Output power: 30mW/channel ■Connectivity: BluetoothR and USB ■Battery type: Rechargeable lithium-ion ■Battery life: 4 hours (high volume), up to 6 hours (low volume) ■Dimensions: 8 cm (H) x 3.81 cm (W) x 3.07 cm (D) ■Weight: Approx. 54g ■Accessories: Power cable, USB-C cable