The Black Box SP387A USB-to-USB isolator provides essential protection for your PCs and USB peripherals against damaging electrical surges, electromagnetic interference (EMI/RFI), and ground loops. This compact 1-port isolator delivers up to 4 kV of electrical isolation, making it ideal for sensitive applications in medical facilities, measurement laboratories, and industrial environments where equipment protection is critical. USB 1.1 compliant and bus-powered for convenient operation, the SP387A requires no external power source—simply connect it between your computer and USB device using the included 1-meter (3.3-ft.) USB cable. The plug-and-play design ensures quick and easy installation while safeguarding your valuable equipment from electrical hazards that could cause data loss or hardware damage. Perfect for protecting expensive medical instruments, precision measurement devices, and other critical USB peripherals in environments where electrical noise and ground potential differences pose risks.