General description This WIFI relay is based on the AI-ESP-01S WIFI module, designed for smart home applications, Internet of Things (IoT) projects, and other DIY endeavors. With this smart relay, you can easily create a smart switch to control any device from your phone, no matter where you are. Technical specifications Power Supply: DC 5V Material: Plastic Package Contents: 4 x Relay Module, 4 x ESP01S Measurement Error: +/- 1-3 cm Other information Supports APP and LUA source code Demo code uploaded in the ESP-01S Note: Light and different displays may cause the color of the item in the picture to differ slightly from the actual product.