The SUN-OT4900 handheld OTDR from SUN Telecom is a lightweight, easy-to-use optical network tester for fiber installation, troubleshooting, transformation, and maintenance. It has a 3.5-inch LCD screen, simple graphical interface, touchscreen and keyboard controls, and auto-sleep and hotkey functions to simplify testing. The SUN-OT4900 provides dual-wavelength testing at 1310nm and 1550nm with up to 8 hours of battery life and can test fiber links up to 120km in length.