The Avalue EPM-1604 is a compact 4-port USB 2.0 hub module designed for industrial and embedded applications. It provides one USB 2.0 upstream interface and four USB 2.0 Type-A downstream ports, facilitating seamless connectivity for multiple USB devices. The module supports both +5V and +12V power inputs, selectable via jumper settings, and operates within a wide temperature range of -40°C to +85°C. Its robust design includes vibration resistance of 5G @ 5~500Hz and shock resistance of 10G @ 11ms. Measuring 80mm x 35mm, the EPM-1604 is an excellent choice for space-constrained environments requiring reliable USB expansion.