No USB to TTL converter required. Compatible with R3 configuration and call syntax. Supports 10 PWM/interrupt/serial port/I2C scalable GPIO. Update expansion boards or custom firmware with R3. Color: Blue Size: 70*40mm Material: Metal Built-in four LED indicators show ESP8266 status: PWR, DFU, STA, AP. Features a stackable design, allowing for easy accumulation of other modules. Integrated ESP8266-12 stable industrial WiFi module with metal casing for interference immunity. Utilizes an enhanced PCB antenna for improved signal. Built-in 5V to 3.3V TTL level converter to prevent damage to the WiFi module from high TTL voltage levels. All board interfaces have standard spacing for easy development. Standard pin interface for full compatibility with pitch, etc. (except for non-standard sizes like Nano, Mini). Easily switch ESP8266-12 module operating modes (e.g., operation and upgrade) using a DIP switch. Integrated serial chip for quick firmware flashing. Employs an advanced 3.3V power supply chip (same as CC3000 expansion board power chip) for more accurate 3.3V output, ensuring ESP8266 operates normally like the CC3000 chip. Application Scope: Remote control aircraft electric/model/ATV, etc. Smart device networking. Home temperature/humidity/PM2.5 monitors, etc. Smart switches, etc. Package includes: 1 x Development Board Note: Light and different displays may cause the color of the item in the picture to be slightly different from the real thing. The allowed measurement error is +/- 1-3 cm.