JOYO -10B Portable Electric Bass Amplifier features various tones, with gain control knob, volume knob, tone control knob and a dual channel switch for adjusting the sound comprehensively. It is compact and portable, plus the Aux in jack, which guarantees pleasant enjoyment out of music while playing your instruments. Features: Dual channel switchable bass amplifier: the real tune of electric bass can be recovered when in the normal channel, and you can also obtain warm overdrive tone when switching in to drive channel. Controls: gain control knob, volume knob, tone control knob and a dual channel switch for adjusting the sound easily. 5 inches customized full frequency speakers and the super loud 10 watt rated power dedicated for the electric bass. 1/8inch Aux-in Jack for playing backing track, 1/8inch stereo headphone output jack, ensuring subtleness of music and interference-free. Different power supply modes, you can also install the batteries(not including) and use it in the open air. Compact and lightweight body, plus 2 hidden shoulder strap buckles on both sides of the amp for conveniently hanging the shoulder strap(not including), easy to carry. Specifications: Power Adapter: EU/US/UK (optional) Main Color: White Rated Power:10W Speaker’s Size: 5inch Input Jack: 6.35mm Headphone Jack: 3.5mm(1/8inch) Aux-in Jack: 3.5mm(1/8inch) Power Supply: 9V 1200mA Power Adapter or 6 * AA batteries(batteries not included) Item Size(L*H*W): Approx. 24 * 17 * 15cm/ 9.4 * 6.7 * 5.9in Item Weight: 1310.7g/ 46.2oz Package Size: 31 * 21 * 16cm/ 12.2 * 8.3 * 6.3in Package Weight: 1858.4g/ 4.1lb Note: Shoulder strap showed in the picture is not included. The AA battery is not included. Package List: I4310US 1 * Amplifier 1 * Power Plug 1 * User Manual (English)