DITEK's DTK-DB series surge protectors are designed to protect serial connections for 9, 15, and 25-pin computer equipment from damage caused by voltage surges. The protectors clamp voltages to safe levels to reduce equipment downtime and failure. Models are available for common serial port sizes and can protect RS-232 and RS-485 interfaces. The protectors are compact, weighing 8 ounces, and include a 10 year warranty.