Tecknowledgey model 7001PC-115 is a Solid State Elapsed Time Indicator (SSETI) designed based upon MIL-DTL-7793/13A (formerly MIL-M-7793/13) that records the time that power has been applied for up to 99,999.99 hours. Requires a military part number M7793/12-1 hand held reader to be read. See Tecknowledgey's model 1170-007 hand held reader (sold separately).