This continuity Tester is capable of checking circuits for continuity and identifying cables and wires up to 10, 000 feet (3, 000 meters) in Length. Bright visual (bi-color LEDs) and loud audible (beeper) indicators allow wire ends to be tested in noisy environments. The R5300 is used by professional electricians, alarm/cable installers and in home audio installations. Lightweight and compact size allows for easy one person operation.