he USB to 4 Ports RS-232 Adapter converts a single USB port into four RS-232 serial ports allowing you to connect to monitor and control your serial devices. (Works with digital camera, cell phone, PDA, modem, mouse, PDA, GPS, ISDN terminal adapter etc.) A cost-effective but high performance, with metal (Aluminum) construction, it provides versatile connections and a robust solution for both harsh industrial environments (no IRQs requirement) and simple desktop installations.