[Universal Compatibility]: This live sound card device is designed to be universally compatible with mobile phones and computers, making it a versatile tool compatible with 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 compatible with 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 percompatible withmance. [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 compatible with your live broadcast or percompatible withmance. It also includes a BT switch compatible with 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 compatible with 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: