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Professional Design - This is a self-locking (bistable) double-pole double-throw relay. Once triggered, the relay pulls in, triggers again, and the relay is disconnected. Function - The DPDT Relay Module with power indicator and reverse polarity indicator.Convenient for your use. Safe to Use - Our Relay Module has Low pulse control mode,Please rest assured to use this product. High Quality - This DPDT Relay Module Made of high-quality electronic components, stable and performance.Easy to install. Service Guarantee - If you have any question or any unsatisfactory about this Relay Module, you can contact our customer service at any time, our team will response you in 24 hours.