Features:1. Compatible with Multiple Models – Designed for Raspberry Pi 3B, 4B, and Zero. Offers a 40PIN interface for direct plug-in after soldering.2. Complete GPIO Testing Function – All GPIO pins are accessible for easy testing of pin functionality and performance.3. Beginner-Friendly Expansion Board – Includes LED indicators and basic functional circuits, making it simple to start learning and experimenting.4. Built-in ADC/DAC & Sensor Support – Features an onboard ADDA chip to read analog signals (e.g., from sensors) and output control signals.5. Durable Terminal Blocks – Equipped with clearly labeled terminal ports for secure wiring and a clean, practical layout.Product Details:This expansion board is designed for easy testing and prototyping with Raspberry Pi. It provides full access to GPIO pins for functional verification, along with ADC/DAC capabilities for sensor projects and signal output. The board includes LED indicators and essential circuits to help beginners get started quickly. With durable terminal blocks and clear interface labels, setup is straightforward and organized. Ideal for learning, testing, and expanding your Raspberry Pi projects.Specifications:- Compatibility: Raspberry Pi 3B / 4B / Zero- Interface: 40PIN- Features: GPIO test points, ADDA chip (ADC/DAC), terminal blocks, LED indicators- Material: Metal + Plastic- Package Includes: 1 × Expansion Board