| http://www.w3.org/ns/prov#value | - Each contains a sensor such as a seismometer or a magnetometer, a low-power computer to record the data, and acoustic transceivers capable of receiving and replying to simple commands, such as ???turn on??? or ???reply to this ping.??? All are stocked with a battery supply capable of running the instrument for the duration of the experiment ??? up to a year for some instruments.
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