Specification: _x005f_x000D_ Specification (optional): HW-665 (CP2104), HW-665B (CH9102) _x005f_x000D_ Working voltage: 3.3-5V _x005f_x000D_ Input current: minimum 500MA _x005f_x000D_ Working current: average 80MA _x005f_x000D_ Working environment: -40~80 ° C _x005f_x000D_ Board size: about 39 * 30 * 5mm/1.53 * 1.18 * 0.19inch _x005f_x000D_ Weight: 12g _x005f_x000D_ _x005f_x000D_ _x005f_x000D_ Note: _x005f_x000D_ 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! _x005f_x000D_ Please allow 1-2cm measuring deviation due to manual measurement. _x005f_x000D_ _x005f_x000D_ _x005f_x000D_ Included: _x005f_x000D_ 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.