Pay attention to: Product does not contain batteries for sale. ●Introduction: This set of tools are available for installation, and inspection of cable line maintenance, and for telephone lines, various state can determine the telephone line in the work, more convenient for telephone line installation, debugging and maintenance ●Function: 1、Judging whether the continuous cable line 2、Tracking cable line, and the discrimination of the circuit breaker points 3、Receiving the cable lines (telephone line) of the audio signal 4、The telephone line to judge the work in the state (idle, ringing, off hook) 5、The transmit audio signal to the target cable line
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