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This 5V bistable relay module is a dedicated control board for automotive start-stop modification. Adopting high-quality single bistable relay chip, it supports one-key self-locking and start-stop function switching. With low standby power consumption and stable trigger performance, it can permanently turn off the original car automatic start-stop function after simple wiring. The compact design is convenient for hidden installation inside the car. 10pcs bulk package meets maintenance, modification and batch use needs, ideal for automotive refitting enthusiasts and electronic DIY application.