Features: This downloader uses CH340C USB to serial port chip and includes an ESP8266 automatic download circuit, making it convenient for users to download programs, upgrade firmware, and perform serial port debugging for ESP-01/01S. Supports IDE, ESP8266 Flasher, and Espressif FLASH-DOWNLOAD-TOOLS and other download software. One-click download with no wiring or button pressing required. The WiFi module automatically enters download mode. ESP Programmer v1.0 is an updated version featuring a reset switch, compatible with ESP-01S that has 4MB flash. Easy to install: directly replaces the old or damaged unit. Application: High performance, convenient and practical for home and professional use. Specifications: Material: Composite Material Color: As shown in picture Product Dimensions: approx. 14x35mm / 0.56x1.38 inches Net Weight: 10g / 0.02lbs Note: Please allow 1-2cm errors due to manual measurement. Due to differences in monitor displays, the actual color may vary from the image. Package Includes: 1 x ESP-01S Programmer Adapter Module