Specification: Specification (optional): HW-665 (CP2104), HW-665B (CH9102) Working voltage: 3.3-5V Input current: minimum 500MA Working current: average 80MA Working environment: -40~80 ° C Board size: about 39 * 30 * 5mm/1.53 * 1.18 * 0.19inch Weight: 12g Note: Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you! Please allow 1-2cm measuring deviation due to manual measurement. Included: 1 x Module 1. Compact Size: Miniature size and lightweight design for easy portability and convenience. 2. Versatile Compatibility: Compatible with various expansion boards, providing a wide range of applications. 3. Dual-Core CPU: Equipped with a powerful dual-core CPU for efficient and reliable performance. 4. Wide Operating Range: Can operate within a wide temperature range of -40~80°C, making it suitable for use in different environments.