This module is an USB adpater /programmer for ESP8266 modules of type ESP-01 or ESP-01S. It is conveniently fitted with a 2x4P 2.54mm female header to plug the ESP01 . Also it breakout all the pin of the ESP-01 via a 2x4P 2.54mm male header, so it is very conveniently for user to debugger the ESP8266. The module is based on the USB-UART CH340C which is compatible with all platforms. Onboard with the ESP8266 automatic download circuit. It is very convenient for users to download ESP-01/01S program, upgrade firmware, serial debugging and so on. It supports lots of software such for Arduino IDE, ESP8266 Flasher and Lexin FLASH_DOWNLOAD_TOOLS . There is no need to press any buttons, the WiFi module will automatically enter the download mode. Specification: Chip: CH340C Working voltage: DC 5V Interface: USB Type A