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Timer which fits onto telephone handset - indicates duration and cost of call and includes buzzer operating one minute before end of call
Timer which fits onto telephone handset - indicates duration and cost of call and includes buzzer operating one minute before end of call
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机译:可安装在电话听筒上的计时器-指示通话时间和通话费用,并包括蜂鸣器,通话结束前一分钟开始操作
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摘要
The timer, for telephone handsets, is mounted directly onto the handset and measures the duration of a telephone conversation and hence the cost. The timer is set manually to the wanted duration of the call by the user after dialling his number and emits a buzzing sound typically 1 minute before the set time elapses. This buzz can be heard by both parties to the conversation. The timer typically has a maximum operation time of about 30 minutes.
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