Transportation Safety Technologies brand Commander 300 and Commander 350 12 volt 5 minute timer systems. Used to disconnect electrical components from the battery system after 5 minutes to avoid dead batteries. Commonly found in ambulance electrical systems. These units are used but were fully functional when taken out of service. $30 shipped in continental US each or both units shipped continental US for $50. I don't use Paypal. I prefer payment with a US Postal Service money order. Thanks.
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