Features: This downloader uses CH340CUSB to serial port chip, and adds ESP8266 automatic download circuit, which is very convenient for users to download programs, upgrade firmware, serial port debugging, etc. for ESP-01/01S. Support IDE, ESP8266 Flasher and Espressif FLASH-DOWNLOAD-TOOLS and other download software software, one-click download, no wiring, no need to press any buttons. The WiFi module will automatically enter the download mode. ESP Programmer v1.0 is a update version, it has RESET SWITCH, and the ESP-01S has 4MB Flash. Easy to install: directly replace the old or broken one. Application: Good performance, convenient and practical, suitable for home and professional use. Specifications: Material: Composite Material Color: As the Picture Shows Product Dimension: approx. 14x35mm/0.56x1.38inches Net Weight: 10g/0.02lbs Note: Please allow 1-2cm errors due to manual measurement. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1PC ESP 01S Programmer Adapter Module