Functional characteristics: 1. Guitar input function:can be used for electric guitar, electric guitar and bass; instrument sound source EQ high, low bass adjustable; 2. Microphone input function:It can be used for wired or wireless microphones with wired or wireless switch, microphone volume and reverb can be adjusted; 3. Headphone output:It can be used for personal practice and does not interfere with the outside world; 4. AUX input function:you can connect the phone or computer to play the sound source; 5. With 18 kinds of drum machine effects, the musician can choose the drum machine accompaniment at anytime, and with his own performance, can experience the performance of the band; 6. Suitable for portable use:Power supply uses built-in large capacity 18650 battery, fully charged battery life up to 10 hours, with USB charging port, can be charged anytime, anywhere with mobile power; 7. Scope of application:electric guitar, daily exercise of wooden guitar, outdoor performances on streets, parks, etc.; 8. International wireless certification:ROHS, US FCC, European CE; 9. Color:black rainproof wooden box, silver iron speaker net; Technical Parameters: Distortion:0.5%AUX; Sensitivity:500mV; Output Power:8W10%SNR:>75dB; Frequency Response:80HZ-20kHZ;  Working voltage:7.4V, 2200MA lithium polymer battery (2 sections);  Charging Voltage:DC5V/2A; Undistorted output power:5W (1???1%, voltage 8.4V full); output power:8W (1???10%, voltage 8.4V full);  frequency response range:80HZ-20KHZ; AUX input sensitivity:500MV; Distortion:???0.5% (1W output); signal to noise ratio:???75DB; guitar input sensitivity:200MV; Battery life:continuous use for more than 12 hours at medium volume; Working temperature:-25 ?? C -60 ?? C; Troubleshooting:; 1.Sound distortion,broken sound:bass volume is too high, please lower the bass volume; 2.No lights or work when starting up:the battery is dead, please charge it in time.; Packaging List: 1*Portable guitar amplifier; 1*USB-DC head power cord; 1*3.5mm Audio Cable; 1*Manual