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Determine the polarity of the telephone line and identify the standby, ringing and off-hook states

Automatically shuts down after half an hour of inactivity to conserve battery power, accompanied by a low-battery alert

Refuse to burn out the machine to protect your personal safety

Comes with a portable toolkit, waterproof and drop-proof, flexible storage of the cable finder and other accessories, easy to go out




Determine the polarity of the telephone line and identify the standby, ringing and off-hook states

Automatically shuts down after half an hour of inactivity to conserve battery power, accompanied by a low-battery alert

Refuse to burn out the machine to protect your personal safety

Comes with a portable toolkit, waterproof and drop-proof, flexible storage of the cable finder and other accessories, easy to go out
