| 摘要 |
A personal device incorporates radio transmitter (10), audible and visual alarms (11, 14), a manually operated alarm button (12) and an attitude-sensitive device (13). Operation of the manual alarm button on actuation of the attitude-sensitive device for a preset time causes transmission of a coded alarm signal. The audible and visual alarms operate during a predetermined time interval (17) after actuation of the attitude-sensitive device, during which time the attitude-sensitive device may be deactivated before an alarm signal is transmitted. |
