This small, lightweight, hand held pump has become our favorite! The pump can be re-charged via 12 volt or 110 adaptors that are included. Each pump holds a charge that will inflate 5 S14s! Most tubes will be inflated in 30 seconds or less, and then a quick top off is required with a hand pump. Perfect for day trips or expeditions, this pump can tuck into a small corner of a dry bag when not in use.