Feature: 1. Premium Designs: Stable onboard ESP 12F WiFi module comes with 4M byte flash large capacity, and the module also has RST reset button and a programmable key. 2. For Development: The I/O port and UART program download port of the WiFi module are all led out, facilitating secondary development. And the ESP‑12F supports the use of multiple development tools and provides reference programs in a development environment. 3. Smart Operation: For controlling loads with operating voltage within AC or DC 30V, the relay module is equipped with LED indicator and 3 onboard shift registers 74HC595 control relay switches. 4. Reliable in Use: Can be widely applied to the WiFi wireless control on various appliances, the development board is a must have for smart home. 5. Easy to Install: Light in weight and compact in size as well, the ESP8266 relay module is very convenient to install within minutes. Specification: Item Type: 24 Channel Relay Module Model: ESP8266 Material: PCB Relay Specification: 10A Relay Channel: 24 Channels Use: Used for wireless control relay on off and embedded system development. Introduction: The 24 channel ESP 8266 10A relay development board is equipped with an ESP 12F WiFi module, with all I/O ports led out. It supports power supply and provides development environment reference coding. It is suitable for secondary development and learning of the ESP 8266, wireless control of smart homes, and other occasion. . Package List: 1 x 24 Channel Relay Module1 x 22P Single Row Pin Header1 x Short Circuit Jumper