| 摘要 |
A wireless doorbell system which employs a radio frequency ("RF") transmitter and a RF receiver. The doorbell transmitter has its RF source and antenna enclosed within a metal case which is designed so that the effective operating range of the transmission of the RF signals is not reduced to unacceptable levels and whose finish, such as polished brass, presents an attractive appearance which can be made to match the decorative trim at the entranceway to a building, such as a residence.
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