Features 1.One person is enough to complete cable continuity check and cable sequence. Can detect 5E, 6E coaxial cable and telephone line wiring failure, including: open, short circuit, cross, reverse and crosstalk. 2.Automatic delay shutdown. Wiring / connection error positioning. Measure the length of the cable, and locate the exact location of the open circuit and short circuit. 3.Cable length dynamic calibration function makes the length of the measurement accuracy is up to 98%. Easy to use and carry. Large screen display makes the test results easy to see. 4.Can be inserted for length measurement whether there is remote recognizer or not. Cable positioning, 8 remote passive test jacks (ID ID1 standard). 5.The remote identification device is with audio prompt function. SCM software watchdog design, reliable operation. Can be powered by at least 2 AA batteries(not included). Features: One person is enough to complete cable continuity check and cable sequence. Can detect 5E, 6E coaxial cable and telephone line wiring failure, including: open, short circuit, cross, reverse and crosstalk. Automatic delay shutdown. Wiring / connection error positioning. Measure the length of the cable, and locate the exact location of the open circuit and short circuit. Cable length dynamic calibration function makes the length of the measurement accuracy is up to 98%. Easy to use and carry. Large screen display makes the test results easy to see. Can be inserted for length measurement whether there is remote recognizer or not. Cable positioning, 8 remote passive test jacks (ID ID1 standard). The remote identification device is with audio prompt function. SCM software watchdog design, reliable operation. Can be powered by at least 2 AA batteries(not included). Specification: Powered by:4 x AA battery (not included) Size: 18 x 9 x 4cm / 7.09 x 3.54 x 1.57inch Package Weight: 757g Quantity: 1pc Package included: 1 x CAT5 RJ45 Network Cable Tester 1 x Accessory 1 x User Manual Note: This product can NOT be used to test device with electricity!