With Its Built-In Electric Pump, Twin Size, 16-Point 5-Inch Bed Height, And VERSATILE ? Perfect for both indoor or outdoor use, this raised 16.5" bed includes a built-in pillow and air pump for convenience; 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 16.5" Dura-Beam Air Mattresses are designed with top and 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 AC ELECTRIC PUMP ? High-Powered built-in electric pump (110-120V) for hassle-free inflation and deflation; users can easily and quickly set up the air mattress when they need it and then deflate it (Approximate inflation time 2.25 minutes) 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