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 transmission. 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 transmission 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 power (red) indicator light, the work of the indicator light normal light relay suction, such as the impact of the protection board automatically adjusts the suction time (to be the current through the relay before suction). Power supply can be the same power supply with the amplifier, the three channels of the sound through the source of the negative pole of each line is independent, suitable for non-common ground and BTL circuit amplifier use: the terminals are 7.62 pitch, 1/2W metal film exceeds the standard use of the internal resistance to reduce the design specifically for high-current! Note: This protection board 15 seconds to switch on and off without a delay (the first time you switch on and off, to be 15 seconds after switching on before there is a delay)! Due to different batches, there may be d