Feature

●FSK / DTMF dual system, powered by phone line, no batteries, energy saving and environmental protection needed
●EASY TO INSTALL: Can be placed on the desktop or on the wall.
●Up to 30 groups 12 digit calls and 10 groups 12 digit calls.
●Call number/time check, fast up/down check and redial
●18 Months Manufacturers Quality Guarantee: We offer 18 Months Quality Guarantee Service, if you have any questions or questions, we will try our best to make you satisfied.

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Description