Industry | Loud and adjustable speaker volume with clear voice and can be used as mobile interphone Easily installed with 3M tape on the wall the theoretical transmitting distance can be up to 300m with no |
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Obstacle | Outdoor bell is power supplied by 4pcs alkaline batteries easy to replace the battery the indoor bell is power supplied by rechargeable Li ion |
Battery | Outdoor bell is paired with indoor bell by learning its code 1 outdoor bell can be paired with N indoor bells and no interference with each |
Other | Two voice intercoms should not be near within 1m or there will be noise interference The actual transmitting distance is surely affected by different environment and obstacles |
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