[Universal Compatibility]: This live sound card device is designed to be universally compatible with mobile phones and computers, making it a versatile tool for all your live broadcast and singing needs. It also supports OTG digital lossless transmission, ensuring the highest quality sound output. [Built-in Battery and Continuous Use]: This sound card is equipped with a built-in 3.7V/1200mAh battery, which can be used for about 6 hours with the amplifier turned on. It also supports charging while using, so you never have to worry about running out of power during a live broadcast or performance. [Comprehensive Sound Control]: This sound card provides comprehensive sound control options, including high/bass adjustment, accompaniment, reverb and recording adjustment, as well as microphone volume control. This allows you to customize the sound to meet your specific needs and preferences. [Multi-function Keys]: The sound card has 7 function keys, 9 sound effect keys, and 15 special effect keys, providing a variety of sound options for your live broadcast or performance. It also includes a BT switch for easy connection. [Power Indicator and Low Battery Alert]: The sound card has an LED power indicator: white light when powered on and red light when charging. It also has a low battery alarm function, which sounds a reminder every 2 minutes, ensuring you always know the battery status and charge it in time. The charging time is about 3 hours when the power is off. Battery: built-in 3.7V/1200mAh (battery can be used for about 6 hours when the amplifier is turned on) Power indicator (LED): power on: white light; charging: red light; low battery status: prompt tone 2 minutes/time Charging time: (power off) about 3 hours Charging interface: Type-C interface Input and output interface: Accompaniment input: 1 channel (3.5 pieces) Condenser microphone input: 2 channels (3.5 ports) Headphone output: 1 channel (3.5 ports) Headphone output: 1 channel (3.5 ports) Live broadcast interface: 2 channels (3.5 ports) OTG interface: 1 channel (TYPE-C port) Charging interface: TYPE-C port Audio performance Analog audio output: /RT, stereo Dynamic range 1kHz: equal 105dB Crosstalk: equal -106dB Signal-to-noise ratio: equal 85dB Output level (Vrms):Vrms (1.0-2.0V 10kR) Headphone output power: 5 mW x2CH Frequency response: 5MHz (Less than -3dB) Dimensions:19.7x12.1x4.2mm/7.7x4.7x1.7inch Colour:A:Black Material:ABS Package Contents: 1 set * Sound card audio mixer 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.