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Amazon.com: KNACRO 4-Channel Programmable Time Relay Delay Switch Module 99-Step Timed Solenoid Valve Linkage Control Optocoupler Isolation PTR4-SP Controller with LCD : Electronics
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MHCOZY WiFi Wireless Smart Switch Relay Module for Smart Home 5V 5V/12V，Ba applied to access control, turn on PC, garage door (5v): Amazon.com: Tools & Home Improvement
