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How will the Wireless Digital Voice Intercom Doorbell work for you?
More secure:With strong communication confidentiality and 2.4GHz ISM digital frequency hopping and encryption, technology robust anti-interference.
Functional utility:Wireless remote unlocking, power saving and far distance communication, transmission distance up to 300m in free field.
Outdoor unit:With touch button, more smooth. Rainproof, anti-oxidation and wear resistance outdoor unit, with rain-proof cover.
Indoor unit: With ringing reminder and flash reminder, which is convenient for the deaf mute person to use; The indoor machine is provided with an unlocking key; When the conversation is started, the electric control lock is opened by wireless communication.

NOTE:Both Indoor and outdoor unit use the high capacity lithium-ion rechargeable battery (model: BL-5J).
Outdoor camera can be powered by adapters or lithium battery; The standby time is 90 days for battery.

Specifications:
Battery work voltage:3.4