DC 12V 6 Channel Relay Remote Control Controller Module Switch RF for Arduino
$15.49
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APDC-6PCX has 5 output modes: self-lock， interlock，non-lock， 3 relays self-lock coexisting with 3 relays non-lock and 1relay self-lock coexisting with 5 relays non-lock. 2．Interlock —— press 2. Press 1 again, the relay 1 is disconnected.