A driver’s license in the power-the-hotel room card slot, one that cuts out the electricity the moment the card is removed – not ideal if you want to leave equipment charging when you’re out and about. Two polar opposite strategies for keeping a card in the slot: using a card of significant value triggers memory to pick up the card; or using a no-hassles-if-its-lost card. The middle ground is dangerous with enough value to be missed, but not enough value to recall.