Features: 1. The product uses a relay to switch signals, ensuring no loss in sound quality. 2. It has no signal amplification function; it only switches the signal source. 3. It supports four channels of audio input, and function switches control the output of the signals. 4. On the function switch board, there are four LED lights corresponding to different audio inputs. 5. The switching order of the audio signals is clockwise or counterclockwise. Descriptions: Color as shown Material: plastic + metal This is a 4-way relay audio input signal selector switch with rotary switching for amplifiers. Specifications: Model Number: WM-046 Power supply range: DC 7-30V, AC 6-20V Note: If choosing the DIY kit, assembly is required for operation. Please consider this before purchase. Package Contents: 1 x Audio Input Signal Selector Switch Only the above package content is included; other products are not included. Note: Lighting and display differences may cause slight variations in color between the image and the actual item. Measurement error allowance is +/- 1-3 cm.