最好使用交流电源供电，并为设备安装保险丝或额定电流小于2安培的自动断路器，自动断路器还必须与其他负载电流电路分离。
It is recommended that AC power supplies to instruments be protected by fuses or automatic circuit breakers rated at not more than 2 Amperes, and must be separated from any load current circuits.
而保险公司，如美国的Progressive公司和英国的Coverbox都要求顾客在车上安装可以测量行程，时速，和地点的设备。
And insurance firms, among them Progressive in America and Coverbox in Britain, ask customers to install equipment in their cars that can measure for how long, how fast and even where a car is driven.
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