DC 5/12V 2/4/16 Channel DB9 RS232 Relay Module Remote Control Switch Smart Home
DC 5V 2-channelRS232 DB9 R elay. DC 12V 2-channelRS232 DB9 R elay. DC 12V 4-channelRS232 DB9 R elay. 2 RS232 DB9 female interface. DC12V 16-channelRS232 DB9 R elay. Each relay has an LED indicator and LCD display for relay absorption.