1. The DC protection is not compatible with Digital Power Amplifier boards or BTL circuits. 2. The horn protection board features power-on delay (approximately 3 seconds) and DC protection (control voltage approximately 1V). The circuit design is simple, safe, and reliable. 3. Equipped with an LED indicator: it illuminates during operation and turns off when protection is activated. Uses dual parallel OMRON relays, suitable for most power amplifier boards. 4. This protection board requires an independent AC 12–18V power supply; it must not share power with the amplifier board. Power handling capacity: 50W–300W Protection board dimensions: 68 × 55 mm Maximum power per channel: 101–130W Model Number: UPC1237 Channels: 2 (2.0) Type: Home Amplifier Color: As shown in image Material: ABS Package Contents: 1 × Speaker Protection Board Note: Lighting conditions and display settings may cause slight color variation between the image and the actual product. Measurement tolerance: ±1–3 cm.