YueYueZou&reg; NetWork Cable Tester Toner RJ45/RJ11/BNC LAN Cable Cat5 Cat6 Detachable with Beeper BNC terminator 25/50 Ohm indications. Straight or crossover indications. LEDs indicate connections and faults of wire and pins. RJ-11/RJ-45 are equipped with 50u gold plating. Compatible with 3 different connector types: RJ11/RJ45/BNC, Detachable module for testing two remote points. Straight or crossover indications.LEDs indicate connections and faults of wire and pins. 300 feet test distance (RJ-45/RJ-11/BNC). Ergonomic portable handheld design. Powered by a 9V Alkaline battery. (Not included) Convenient battery access. Low Battery Indicator. Simple one button test. Fast speed testing. High quality warranted.