If the beeper beeps the reception is jammed or the voltage of the battery is too low.
如果蜂鸣器发声，表示接受受到了干扰或者电池电压过低。

Her machine broke, and she's been using her old machine and she doesn't have the beeper for it.
她的答录机坏了，她在用老的答录机，没有一个留言。

Resistance to 400K ohms coupled with a continuity beeper provide the convenience of a multimeter in a clamp meter.
抗40万欧姆加上连续性呼叫器提供方便万用表在钳形表。