1、Speaker protection board, the circuit is simple, safe and reliable, and easy to use. 2、Has the functions of start-up delay (about 3 seconds) and DC protection (control voltage about 1V). 3、With LED light indication, it lights up when working, and goes out when the protection starts. 4、Working voltage AC12‑18V, independent power supply is required, otherwise, the power amplifier board may be damaged. 5、Withstand power 50W‑300W, using high‑end relay, suitable for most power amplifier boards. Item Type: Speaker Protection Board Material: Printed Circuit Board Scope of Application: For Most Power Amplifier Boards Working Voltage: AC12-16V (Requires Independent Power Supply) Supportable Power: 50W-300W 1 x Speaker Protection Board 1 x Support Column 8 x Screws