该系统的能源由一台12伏的接收机和一台12伏的发射机提供，它们可从公用电源或救急车中充电。
The system is powered by a 12-volt receiver and a 12-volt transmitter that can be recharged from the mains or an emergency vehicle.
本电缆不能直接连接到低阻抗电源如公用电网上。
The cable are not for direct connection to a low impedance source, such as the public mains electricity supply.
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