This little machine runs on batteries. I mistakenly thought it would use the "adapters" to power the pump, not charge the batteries. However, that being said, the battery power was sufficient. It inflated one adult size innertube and 3 child size innertubes, one after the other, with no signs of "getting tired". You're supposed to recharge the batteries after 20 minutes use. So, be aware of that before you go camping or to the lake and expect it to perform. Make sure it's charged and ready.
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