Groupon offers the Cobra Traveler 130-watt power inverter (CWA P135) for $19.99 ($39.95 list price) or the Cobra Microport 150-watt power inverter (CWA P155) for $27.99 ($49.95 list price). Shipping is free.

What makes this deal hot:
You save 50 off the retail list price. That's the lowest price we could find currently.

What this does & Why you need it:
The Cobra Traveler power inverter converts car or airplane outlets into AC outlets or USB ports to charge your devices on the go.