Main function characteristics: 1.Localization and connection / connection error. 2.Easy to use, large screen display the test results stick out a mile 3.And easy to carry, long battery life (50 hours of standby time 4.Automatic delay shutdown 5. 8 distal passive testing socket (identification number ID1-ID8 6. The distal identification appliance audio prompt function 7.And self checking function, can automatically compensate the variation of the battery power, the influence of environmental temperature change 8.MCU software watchdog design, reliable operation Length measurement of twin twisted cable: Scope : 1350M (31,200 FT) Calibration accuracy : 3% (± 0.5m or ± 1.5 ft) (calibrating cable > 5 M) Shipment accuracy : 5% (± 0.5m or ± 1.5 ft) (AMP, AT&T Class 5 cable) Display: M or FT Length calibration: User can set calibration factor by himself by a given length cable. The length of calibrating cable is more than 5m. Working temperature: -10°C to 60°C Powered：4pcs AA batteires (NOT included) Dimension: 180 x 80 x 40 mm Package Inluded: 1 x Multi-Network Cable Tester 1 x Far-End Test Jack 1 x Instruction Manual