Features: 1. Playing An Old CD Player, Using An Adapter For Direct Power Supply, But The Dynamic Range And Are Insufficient. 2. So I Temporarily Modified The Supercapacitor Board Used By The , 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 '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 Supercapacitor Filtering Description: 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 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 Pond For Energy Storage. After It Is Used, The Detail And Dynamic Range Will Increase. Material: ABS Color as shown Package Contents: 1 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.