Fangrui Product Details Fangrui Product Details Fangrui Product Details 1. With Time Delay And Dc Protection (default 1.8v Start Control, Dc Sensitivity Can Be Adjusted). 2. Relay As The Core Component Is Not Afraid Of Contact Ignition And Oxidation, No Loss Of Tone Mission. 3. This Protection Board Uses 1.6 Thick 1a Copper Surface, Double-sided Tin-plating Process. 4. This A Common Power Dc Protection Board Using Optocoupler, Because The Optocoupler Has A Mutual Isolation Between The Input And Output, Electrical Signal Mission Has A Unidirectional Characteristics, And Thus Has A Good Electrical Insulation Ability And Anti-interference Ability. 5. And Because The Input Of The Optocoupler Belongs To The Current-type Work Of The Low-resistance Parts, Thus Has A Strong Common Mode Rejection Ability, To Achieve The Separation Of The Power Supply And The Sound Source, Will Not Have An Impact On The Sound Source. Product Parameters: Voltage Input Dc12-16v Or Ac12-16v Sound Channel: Independent Three-channel Can Withstand Power: 300w X 3 Or Less Instructions For Use: Turn On The