The mini amplifier has multi-effects, high-quality mobile phone recording, wireless music playback, bypass mode, adjustable volume, and other functions in one. Features: Multi-Effect -- Contains 10 classic Preamp, two commonly used modulation effects Chorus&Phaser, a Hall Reverb effect, 10 classic IR cabinet simulations, and a high precision Tuner. Internal Recording - Provides a high-quality internal recording function, plug into the USB port of the device through a dedicated data cable for internal recording, and then connect to your mobile phone or computer for audio recording. More Features - Wireless music playback, bypass, volume settng, tone, tuning, and gain adjustment. Mini&Rechargeable -- It is lightweight and portable, and able to work for about 5-6 hours after a fully charge, convenient for you to carry around. Practice Amp - Nice for beginner to practice electric guitar without creating much noise. The amp allows you to produce sound through headphone or wireless earbuds. Equipped with standard USB2.0 port, 1/8-inch(3.5mm) headphone output jack, and 1/4-inch audio plug. Specifications: Material: ABS Color: Gold Input: Standard 1/4-inch interface mono/TS Output: Standard 1/8-inch interface mono/TS Sampling Rate: 48K/24bit Battery Capacity: 780mAh Work Time: about 5 to 6 hours Power Supply: DC5V, >300mA power adapter Item Size: 8.4*8*2.8cm / 3.3*3.14*1.1in Item Weight: 55g / 1.94oz Package Size: 10.5*9*3.5cm / 4.13*3.54*1.37in Package Weight: 114g / 4.02oz Packing List: 1 * Headphone Amplifier 1 * Charging Cable 1 * Internal Recording Cable 1 * User Manual