The Letter Logger can be programmed to check its position every few minutes, over longer intervals, or only when a built-in motion detector senses movement, says Jude Daggett, of TrackingTheWorld.

• TrackingTheWorld公司的JudeDaggett介绍说：信件跟踪GPS设备可以被编程为每隔几分钟，或者时间间隔更长些，或者只在内置的行动探测器感觉到运动时检查一下它的位置。