Parameter Model ESP8266Color GreenSize L W H 65 x 40 x 18 mmISM 2 4 GHzPA 25 dBmRelay voltage 220 VRelay Current 10 AInput voltage DC 7 V 30 VInput overvoltage protection YesInput overcurrent protection YesFeatures 1 More safe with relays PCB pin anti climb design 2 With ESP8266 Wifi module 4 layers board design 3 One output status indicator one input status indicator 4 220V 10A relay one normally open one normally closed 5 One way optocoupler isolation input TVS input protection 6 Access control server via TCP CLIENT mode Via HTTP protocol control High current terminals 7 Input overvoltage protection input with TVS when voltage exceeds 33V automatic protection will operate Click to download instructionPackage included 1 x ESP8266 WIFI Module