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SQR117 220V AC Square Siren RF433 MHz Transmitter Receiver Wireless Module [CH1] Relay 1 (NO [CH1] Relay 1 (NO COM NC) [CH2] Relay 2 (NO COM NC) [CH3] Relay 3 (NO COM NC) [CH4] Relay 4 (NO COM NC) [ANT] Antenna Wire [LEARN] Learning Pairing Button 5 12V DC adapter to the barrel jack or plug in a USB cable for 5V input Ideal for factory alarms ensure proper weatherproofing and enclosure
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