1、There are 12 background sound effects. 2、Volume adjustment and reverberation size adjustment. 3、Support live sound card and power bank two functions 4、Can be karaoke and live broadcast anytime, anywhere. 5、Compatible with most karaoke apps and live apps Features: There are 12 background sound effects. Volume adjustment and reverberation size adjustment. Support live sound card and power bank two functions. Can be karaoke and live broadcast anytime, anywhere. Compatible with most karaoke apps and live apps. Support system: for Android / Apple mobile phone system. Support ear return function. Solved the problem that for Apple mobile phones can't record. Built-in intelligent power management chip. Low power standby. Specification: Product model: MSCP-C3 Color: Silver / Rose Gold (Optional) For DSP: AU8204 Frequency: 240mhz Kernel: 32-bit RISC core Memory: 16mbit for SPI FLASH Plug-in equipment: headphones, mobile phones, microphones, etc. Battery type: polymer lithium ion battery Battery capacity: 4000MAH Battery voltage: 3.7v Standby time: 15 days Charging time: ≤ 2 hours Product Functions: Mini USB charging port Large USB discharge port 3.5mm ear label interface 3.5mm audio input Red and blue two-color charging and discharging indicator Blue boot power indicator Package List: 1* Sound card 1* Instruction manual 1* Headphone + microphone 1* USB charging cable 1* Audio cable 1* USB to 3.5mm audio cable Note: 1. This product is not equipped with a charger and can be used with a universal charger for mobile phones. 2. Please check the instructions for detailed use.