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10pcs 5V 6V 9V 12V 24V Flip Flop Latch Relay Module Bistable Self locking Switch Board for Arduino UNO pump door lock dc motor|Relays| - AliExpress
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DC 6V 9V 12V 24V 4 Channels Flip-Flop Latch Relay Board Bistable Self-locking Electronic Switch Module for Arduino UNO IO Control [IO25D04] - USD $9.99 : canton-electronics.com
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