Features: 1. Playing An Old CD Player, Using An Adapter For Direct Power Supply, But The Dynamic Range And Fineness Are Insufficient. 2. So I Temporarily Modified The Supercapacitor Board Used By The Raspberry Pi, And I Felt That The Sound Quality Has Changed Significantly. When Playing Cd, The Dynamic Range Has Increased Significantly. 3. Ordinary Walkmans Originally Performed Close To The Performance Of Sony'S High-End Cd Walkmans. 4. The Previous Low-End CD Player Was Dry And Weak. 5. 5V Power Supply Filter Type C Input And Output Is Suitable For Raspberry Pi Supercapacitor Filtering 1. It Contains 8f Supercapacitor And Intelligent Buffer System, Which Is Suitable For The Input Of 10w Adapter, And The Output Supports Typec And Usb-A Port Output. 2. With 10%-100% Indication Of Input Voltage Indicator Lamp. 3. Type C Input, Type C And Usb A Output. It Can Be Driven With An Ordinary 3a Adapter. In Addition, It Also Supports Usb Communication And Can Be Connected Between Pc And Usb Sound Card. 4. It Is Equivalent To A Large Pond For Energy Storage. After It Is Used, The Detail And Dynamic Range Will Increase. Material: ABS Color as shown Package Contents: 1 x Power Filter Note: Different Batches May Have Differences In Product Appearance, Color, And Printed Characters, Which Will Not Affect The Use 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.