Features: 1. for Supercapacitor Power Filter 2. Moode, Volumio, Picoreplayer, Runeaudio 3. After Installation, The Sound Quality Becomes Better And The Power Is Surging. 4. Supercapacitor Plate Current Flows Through, Transient Voltage Suppression, Anti-Surge Circuit, 5. The Microcapacitor Filter Output Is Equipped With An Infrared Receiver For Remote Control. After Being Fully , The Instantaneous Discharge Current Can Reach More Than 30a. Description: 1. You Can Use The 3a Adapter. Previously, It Required An Adapter With At Least 4a To Push It. 2. Equipped With A Physical Switch To Support One-Key Shutdown; 3. Added 3.3v Filter For ; 4. After Startup, The Power Supply Voltage Is Equal To The Voltage Of The Adapter, And There Is No Power Suppression. Solve The Problem That Some Non-Volumio Systems Cannot Start. material: metal Color as shown Package Contents: 1 Filter Board Note: Different Batches May Have Differences In Product Appearance, Color, And Printed Characters, Which 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.