SDR-stick and RTL_433 - 5 days of monitoring

Some days ago I setup a simle RTL-SDR based monitoring station. Now after about 5 days of more or less constant monitoring I found one interesting thing:  

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One of my neighbours has a TOYOTA car. Its TPM sensors seem to transmit permanently. As you can see here, more or less regularily:

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So I assume this car must have a pretty large battery, where this constant power consumption did not harm?!

The number of other detected TMP sensor is small, compared to the traffic on my road.