S4 Guitar Mini Amp 10W Rechargeable Bluetooth Guitar Amplifer Combo for Desktop Practice S4 10w Mini Guitar Amp with bluetooth, The S4 can play for up to four hours at a output of 10 watts. Even so, its tiny design makes it easy to handle with one hand.You can go everywhere with this mini amplififier, just plug and play. Built-in battery: Fully rechargeable Product name: S4 guitar mini amp Charge method: type-c (5v in) compatible mobile phone charger Speaker power: 5 watts x 2 speakers Power source: battery powered Compatible devices: eletrict guitar Guitar input: 1/4 inch plug jack 6.35mm Headphone output: 1/8 inch plug jack 3.5mm Switch: clean/DIST.,power on/off (bluetooth on/off) Knobs: Master vol.: control the master volume Gain vol.: control the amount of gain Tone: control the tone Level: Controls the overall signal volume Item size: 145 x 95.5 x 102.5mm Item weight: 0.68kg Color: As Shown Material: ABS+Metal Package Contents: 1 * Guitar 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.