The 4000mAh battery can last for a long time to meet your live broadcast or singing needs Bluetooth/accompaniment/TF card/OTG input, multiple connection methods, easily handle more scenarios IOS/Android/Windows fully compatible, intelligent compatible with 99% live broadcast software Digital DSP processing chip is adopted to realize independent adjustment, high and low pitch, reverberation, accompaniment, recording, etc. Pop/Subwoofer/Pure Vocal mode, one button switching, you can choose the desired effect as you want Specification: Function: Sound card function: yes Bluetooth speaker function: yes Card reader: TF card Built-in Battery Playback: Yes Play while charging: yes Low Power Indicator: Yes (Beep) Supported audio formats: MP3 WAV WMA FLAC APE Sound adjustment: treble, mid-bass adjustment; accompaniment, reverberation, recording adjustment; microphone volume adjustment; speaker volume adjustment Lighting control: Aperture with self-flashing seven-color lights; left and right potentiometers always turn on three-color lights; spectrum light under the potentiometer jumps with the size of the music Audio switch: Yes (there is no sound after the audio is turned off, and the sound card function can be used normally) Function keys: 12 keys Sound effect keys: 6 keys Special effect keys: 12 keys Bluetooth switch: support Bluetooth playback operations: pause, previous song, next song Power Specifications: Power supply (adapter): DC 5V/3A Battery: Built-in 7.4V/4000mAh (when the power amplifier is turned on, the battery can be used for 3 to 3.5 hours) Power indicator light (LED: power on: white light; charging: red light; low power state: prompt tone 2 minutes/time Charging time: Quick charge (power off) 4.5-5 hours Slow charge (charge while playing, power amp moderately on) 9-12 hours Speaker Specifications: Model: full frequency speaker 4Ω5W Size: 52x52x32mm Rated impedance: 4Ω±15% Rated power: 5W Frequency range: F0-20KHZ Characteristic sensitivity: 84dB±2dB Resonant frequency: 400HZ±20% Harmonic distortion: ≤5% Audio Performance Specifications: Analog audio output: LT/RT, stereo Dynamic range 1kHz: ≥80dB Crosstalk: ≥70dB Signal-to-noise ratio: ≥85dB Output level (Vrms): Vrms (1.0~2.0V 10kR) Headphone output power: 5mW x2CH Speaker output power (rated value): 5W x2CH Speaker output power (peak to peak): 10W x2CH Frequency response: 5MHz (<-3dB)