1. Easy Switching: If you have multiple audio devices that need to share audio or power amplifiers, you can connect multiple devices simultaneously and use the output from them, which is convenient and practical without having to switch. 2. 1 In and 4 Out: 1 RCA stereo input and 4 RCA stereo output interfaces are more than enough to meet your various work needs. 3. Reliable Function: Multiple audio sources can be connected simultaneously without affecting each other and can be mixed or output separately. 4. Power Supply: DC 12V power supply, preferably a linear power supply, switching power supplies are prone to generating noise. 5. Power-Off Memory: The power-off memory function will remember the last state after power-on, greatly simplifying operation. Item Type: Audio Switch Material: ABS Input: DC 12V Remote Control Power Supply: 1 x CR2025 3V 150MAH button battery, comes with built-in battery. 1 x Audio Switch 1 x Remote Control