Sound card function: yes Built-in battery use: yes Use while charging: yes Low power indicator: yes (prompt tone) Sound adjustment: recording, reverb, monitoring adjustment; microphone volume adjustment; Light adjustment: yes Function buttons: 8 keys Sound effect buttons: 8 keys Special effect buttons: 8 keys Bluetooth switch: support Accompaniment input: 1 channel (3.5inch ports) Condenser microphone input: 2 channels (3.5inch ports) Headphone output: 1 channel (3.5inch ports) Headphone output: 1 channel (3.5inch ports) Live broadcast interface: 1 channel (3.5inch ports) OTG interface: 1 channel (TYPE-C port) Charging interface: 1 channel (TYPE-C port) Dynamic microphone interface: 1 channel (6.35inch port) Analog audio output: /RT, stereo Dynamic range 1kHz: ≧105dB Crosstalk: ≧-106dB Signal-to-noise ratio: ≧85dB Sampling rate: 44.1KHz/16bit Headphone output power: 20mW Frequency response: 20Hz-20KHz Power supply (adapter): DC 5V/1A Battery: Built-in 3.7V/800mAh Power indicator (LED): Power on: white light; Charging: red light; Low power status: Prompt tone 2 minutes/time Charging time: (power off) about 3 hours Charging interface: Type-C interface Color: Black Material: ABS Package Contents: 1 x TYPE-C data cable 2 x 4-section audio cable 1 x sound card 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.