The Spare Mobile Connector is just a wire and the connector: The Universal Mobile Connector has a big box along the wire: What technically is going on that the Spare Mobile Connector gets away without such a box? What are the limitations of the Spare Mobile Connector? Could I feed 20 amps through it at 110volts? Could I feed 15 amps through it at 220volts? What's driving this is that I stayed at a friend's beach house this past weekend, and they only have 110volt outlets. I was thinking about getting the Quick 220 thing to piece two 110volt out of phase outlets into a single 220volt outlet, but then I would have had to have brought my UMC, and then the total package was getting alot bigger than I had room for in the Roadster trunk. So, I paid a visit to the SLO 70 amp chargers and spent a couple hours at Starbucks doing work.