Intex 64157E Dura-Beam Plus Mid-Rise Air Mattress: Fiber-Tech ? Twin Size ? The Twin Dura-Beam series Comfort Airbed is a great portable sleeping solution with a built-in pump powered by any USB-A power source rated 2 Amp and higher. The USB pump is not only smaller and lighter but also more energy efficient than traditional electric pumps. Simply connect the included USB-A cord to the power source of your choice and inflate or deflate within minutes. ? VERSATILE ? Perfect for both indoor or outdoor use, this raised 14" bed includes a built-in USB pump that is convenient and versatile; the unique construction provides superior stability with a soft, velvety sleeping surface ensures a good night's sleep ? STRENGTH ? Unlike traditional air beds that tend to sink or dip over time, our 14" Dura-Beam Air Mattresses are designed with bottom ring stability to withstand the weight of the sleeper without sagging or losing its shape ? FIBER-TECH BEAM CONSTRUCTION ? Comprised of thousands of high-strength polyester fibers that provide enhanced comfort, stability and support; Fiber-Tech Beam Construction can withstand more weight and pressure without losing its comfort or stability ? BUILT-IN USB ELECTRIC PUMP ? Convenient and versatile to use with your phone charger, 12V USB car charger, or a portable battery; the USB pump is more energy efficient than traditional electric pumps ? STRETCH ? At first inflation the material will STRETCH, which is sometimes misinterpreted as leaking; You will sense a loss of pressure, that's just the bed stretching, simply re-inflate the bed again; the bed will fully settle within 2-3 nights