The Vention KEFB0 Network Cable Tester is a versatile and reliable tool for testing both RJ45 and RJ11 cables. This network cable tester supports 8P, 6P, and 4P network and telephone cables, making it ideal for a variety of testing purposes. The tester has a removable section for remote testing, which allows you to test wires from up to 300 meters away. It has gold-plated connectors for corrosion resistance and a strong ABS cover for further protection. This network cable tester features slow and quick test modes to provide accurate and efficient testing. It is powered by either a micro USB or a 9V battery, allowing for flexibility in a variety of testing scenarios. The Vention KEFB0 Network Cable Tester is a vital instrument for anyone dealing with network or telephone lines, assuring dependable and efficient connections.