Fangrui Product Details The Module Is Safe, Reliable And Scalable To Various Applications. The Expansion Board Adopts A Double-layer Design, With One Pin On Both Sides. Stable And Highly Reliable. Provide Good Contact And Stable Signal Transmission For Your Esp32 Board The Breakout Board Can Expand One Gpio Pin Of The Esp32 Development Board To Two, Which Is Very Suitable To Reuse All The Pins, And Is A Good Tool For Your Smart Home Projects The Esp32 Integrates Antenna Switches, Rf Baluns, Power Amplifiers, Lnas, Filters And Power Management Modules, And The Entire Solution Takes Up Minimal Pcb Area. 2.4 Ghz Wi-fi Plus Bluetooth Dual-mode Chip Color: As Shown Material: Pc+metal Package Contents: 1 X Esp32 Expansion Board 1 X Development Board Only The Above Package Content, Other Products Are Not Included. Note: Light Reflection And Different Displays May Cause The Color Of The Item In The Picture A Little Different From The Real Thing. The Measurement Allowed Error Is +/- 1-3cm.