| 摘要 |
PROBLEM TO BE SOLVED: To provide an alarm system suppressing decrease in response.SOLUTION: An alarm system comprises: an alarm unit 1a connected to a transmission device (a master unit 2a) for transmitting radio waves; and an alarm unit 1b connected to a reception device (a slave unit 2b) for receiving the radio waves. The transmission device is configured to be able to transmit the radio waves by using a plurality of channels and regulated not to be able to continuously transmit the radio waves using one channel exceeding a predetermined time duration. The transmission device transmits the radio waves using one channel within the predetermined time duration and thereafter continuously transmits the radio waves using another channel within the predetermined time duration. |
