Item Type: Cable Tester Power Supply: DC 9V alkaline battery (not included) Operating Current: Tester: 20mA Receiver: 150mA Signal Transmission Mode: Multi-Frequency Pulse Signal Output Level: 8Vp-p Signal Transmission Distance: 3km Size: Emitter: 130x60x33mm / 5.1x2.36x1.3in Receiver: 210x35x25mm / 8.27x1.38x0.98in1UTP STP RJ45 RJ11 cable tester. 2Automatically and efficiently scan incorrect wiring, wireless cable, open circuit and short circuit. 3Provide TEL BNC test (requires adapter). 4Remotely test up to 1000 feet cable (including remote kits). 5Protection power supply switch, low power consumption. 6High quality protective cover provides safer protection. 7Determine the continuity of the cable or wire. 8Track cables or wires and diagnose breakpoints. 9Receive audio signals on cables or telephone lines. 10Identify the working status of the telephone wire (clear ring, busy). 11Send a single fixed sound or double alternating sound to the object cable or wire. 12Come with an earphone for use in noisy environment. 1 x Emitter1 x Receiver1 x RJ11 Cable1 x RJ45 Cable1 x Earphone1 x Adapter Cable with Alligator Clip1 x User Manual