双向寻呼设备，如 RIM

Two-way paging devices, like RIM

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该系统会寻呼设备，若设备作出响应，则发送消息。

The system pages the device and, if it responds, delivers the message.

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辐射探测器有几种型号，有的是手持设备，有的腕式手表一样，有的像寻呼机一样挂在皮带上。

Radiation detectors come as hand-held devices, wrist watches and pager-size gadgets that hang from the belt.

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