The speaker protection board using UPC1237 dedicated chip design and manufacturing,has a -on delay and DC protection, shutdown feature,all-round protection of your expensive speaker Sheet selection 1.6MM thick high-FR-4 board manufacturing tin foil sprayed,10A relay is loose music quality, the resistance rings are gold film resistor copper feet. And with a red indicator, relay approximately 3 seconds,indicating that green light,the work indicator.The protection board using a single supply voltage AC 10V-18V,DC 12-24V,you can take a group of electric to the amplifier board.Try to use conditional independence winding or separate supply.Mute delay boot,shutdown speed off.Amplifier midpoint potential protection,the midpoint of DC from the control point of Greater than 0.7V.All finished boards are good debugging,and test.Size:6.5x5cm/2.56x1.97inchColour:As shownMaterial:PCBPackage Contents:1 x Protection Circuit BoardOnly 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.