The speaker protection board has a power-on delay and DC protection,instant shutdown feature,all-round protection of your expensive speaker! Mute delay boot,shutdown speed off. Amplifier midpoint potential protection,the midpoint of DC from the control point of more than 0.7V. All finished boards are good debugging,and power test. Note: 2 sets of BTL circuit strings are required. The speaker protection needs winding power supply, and cannot share power with other circuits. Colour: Green Material: ABS Size: 68x50mm Package Contents: 1 x Protection Circuit Board Only the above package content, other products are not included. Note: Light 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. Mute delay boot,shutdown speed off. The speaker protection board has a power-on delay and DC protection,instant shutdown feature,all-round protection of your expensive speaker! Note: 2 sets of BTL circuit strings are required. The speaker protection needs winding power supply, and cannot share power with other circuits. Amplifier midpoint potential protection,the midpoint of DC from the control point of more than 0.7V. All finished boards are good debugging,and power test.