News post & update: eleccircuit.com |  |
| The telephone line status indicator Posted: 14 Jan 2014 04:34 AM PST This is a telephone line status indicator to prevent the hearing others talk on the phone accidentally and a Protection to making phone calls simultaneously. The telephone is a communication device that enables to communicate to each other, although it is far or near. Formerly, one phone number. Be used with only one phone. But […]  |
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