Airline In-seat Power Supply System
Two different airline in-seat power supply system (ISPSS) standards for DC power have been used in the past. American Airlines has in the past used an automotive cigar lighter socket. Most other airlines that provide DC power use the EmPower system, which has a 4-pin Hypertronics' D-series connector smaller in diameter and overall size than a cigar lighter plug. It uses 15 volts maximum 5 amperes.
Read more about this topic: DC Connector
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