Features 1、POWER SUPPLY: The relay module can be powered by DC8‑80V, DC5V USB or pin header 5V, which has strong practicability. 2、1 CHANNEL RELAY: Onboard 1 channel 5V relay, output switch signal is suitable for controlling load within AC250V or DC30V. 3、ONBOARD PARTS: Onboard mature and stable ESP‑12F WIFI module, large capacity 4M Byte Flash, onboard WIFI module RST reset button. 4、MODULE PORTS: The I/O port and UART program download port of the WIFI relay module are all led out to facilitate secondary development. 5、WITH LED INDICATOR: With power indicator, programmable LED and relay indicator, the operating status is clear at a glance. Specification Item Type: Relay Module VCC, GND: DC8-80V power supply MICRO USB: DC5V USB power supply 6X6MM Button: ESP8266 reset button UART Program Download Port: ESP8266 GND, RX, TX, 5V are respectively connected to the GND, TX, RX, 5V of the external TTL serial port module, 100 must be connected to GND when downloading, and then disconnect the connection between 100 and GND after the download is complete GPIO pin header lead out port Relay Output: NC: Normally closed, the relay is short connected with COM before it is closed, and it is suspended after it is closed COM: Common port NO: Normally open, the relay is suspended before being closed, and shorted to COM after being closed With Power Indicator LED Programmable LED: Control using GPIO16 Relay Indicator LED: Lights up when closed Package List 1 x Relay Module 2 x Double Pin Header 1 x Single Pin Header