The ESP-01S Relay Module is based on AI-Thinker ESP-01S Wi-Fi Module. It is mostly used in smart home to control any device with the help of phone. The demo code is already uploaded in the ESP-01S just required to supply a DC5V and you can control it. It is designed for DIY projects, internet of things and smart home. It can be used by its APP or LUA source code can be used.

ESP32-Wroom-32(ESP-WROOM-32)is a powerful, generic Wi-Fi+BT+BLE MCU module that targets a wide variety of applications, ranging from low-power sensor networks to the most demanding tasks, such as voice encoding, music streaming and MP3 decoding.

The ESP32-CAM-MB is an improved version of the ESP32-CAM with a USB-to-serial CH340G adapter, making programming much easier since it does not require an external FTDI module. The ESP32-CAM is a small, low-cost development board that integrates an ESP32-S microcontroller with a camera module, making it ideal for image processing, video streaming, and IoT applications. Here are its key features and specifications:

1. The smallest 802.11b/g/n Wi-Fi BT SoC module.
2. Low power 32-bit CPU, can also serve the application processor.
3. Up to 160MHz clock speed, summary computing power up to 600 DMIPS.
4. Built-in 520 KB SRAM, external 4MPSRAM.
5. Supports UART/SPI/I2C/PWM/ADC/DAC.
6. Support OV2640 and OV7670 cameras, built-in flash lamp.
7. Support image WiFI upload.
8. Supports TF card.
9. Supports multiple sleep modes.
10. Embedded FreeRTOS.
11. Supports STA/AP/STA+AP operation mode.

The ESP-12 is a self contained 802.11 b/g/n WiFi enabled microcontroller featuring the ESP8266 SOC. Pin for pin compatible with other boards in the ESP-12x range with stability and wireless capability. It has 4Mbyte flash memory and software updates can be rolled out to it over-the-air. Use it as a cheap and easy way to add Wi-Fi connectivity to your Arduino / Raspberry Pi etc, or use it as a powerful standalone Wi-Fi enabled MCU in its own right.