RS232 Relay Board 4Ch Remote Control Switch with DB9 Female Interface for Car Motor and Smart Home Garage Door

HIGH QUALITY-- The module adopts high quality material for long lifespan, it features quick response and high reliability, durable in use. EASY INSTALLATION-- The relay is equipped with RS232 DB9 female interface, which is suitable for most of devices. It has simple construction for easy wiring. 4 CHANNEL-- This is 4 channel relay module can be used to control car motor and other electric devices. DC 12V power supply (voltage range 9-13v). Multi-Function Control: 6 operational modes: Read, Open/Close, Self-Locking, Actuation, and Interlocking, engineered for precision in industrial automation systems. Streamlined design integrates safety protocols and rapid-response logic. FEATURE-- Standby current (all relays closed) 18MA, 1 channel relay open 50MA, 2 channel relays open 81MA, 3 channel relays open 110MA, 4 channel relays open 141MA.