Device specification : USA SELLER Board comes fully assembled Comes with programmed ESP8266 WIFI module Default firmware type Access Point, SSID inch 16CH relay AP inch , default IP address 192.168.4.1 PCB board dimension 130mm x 150mm Operation DC voltage 5.0V Maximum peak current @5.0V 2000mA Maximum current per relay 10A peak LEDs indicators for each electromagnetic relay channel Relays with SPDT switch contacts: Normally Open, Common, Normally Closed Relay contact resistance 100 milliohms max. ( initial value ) Relay insulation resistance 100 MOhm min. (DC 500V) Relay operation time 8 ms max Relay release time 5ms max Relay dielectric strength 750 VAC, 5060Hz between contact Relay dielectric strength 1,500 VAC, 5060Hz between all elements Relay expected life Mechanical - 10,000,000 operations min. Relay expected life Electrical - 100,000 operations min. at rated load Working temperature range - 25 C - + 80 C The module contains an I2C expander 16bit MCP23017 chip The logic power supply voltage should match the voltage levels on the I2C bus. WIFI ESP8266 sample codes, Webpage interface: Full project on Github - https:github.comkrida0electronics16-Channel-WEB-Relay ESP8266 WIFI Access Point, ip address 192.168.4.1 - https:github.comkrida0electronics16-Channel-WEB-Relayblobmain16ch relay wifi web AP.ino ESP8266 WIFI Client - https:github.comkrida0electronics16-Channel-WEB-Relayblobmain16ch relay web CLIENT.ino