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May with the handset telephone conversation doorbell
2011-06-10 10:55:39
A theft-proof effect of intelligent doorbell, after visitors pressed the doorbell, as long as no one answered in 10 seconds, connecting doorbell will master this phone, so that has sneaked into housing attempts at theft thief heard phone after the main answer, will think in the family, "discourage".

This built-in SIM card in the smart door bell, principle of reintegration cell phone, Bell has both a mobile phone

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