The ring will only available when use outdoor unit to call indoor unit.
This is a powerful Intercom Bell, the out door unit is waterproofed, anti-oxygenationed and long grinded treatment for aluminium-alloy panel. That is No radiation, low power consume and 7 inch TFT high definition colour picture. And it is multi-fuctional , With functions as monitor, call, door-key, non-lift answer, no disturber, indoor call.
Security & Smart Home
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Retail: US$ 209.94