China ISUP It has two air sacs and they're not communicating, it must be inflated and deflated through two different valves, this is great for dealing with water emergencies just make sure any one of the air chambers is inflated, and it will help keep you out of the water, because it is a power board that will take you farther and deeper into the middle of a lake or sea锛宼hen we need to consider the safety of users, no one can help you in those places, you can only rely on our products to be more powerful, safe and durable. Our manufacturing philosophy is production a stable performance, simple to use, lightweight and portable, convenient to install, Safe and environmentally goods. The double chamber electric iSUP board consists of three parts: 1.Main body of the board ModelBLS-119 N.W16KG G.W20KG M.L.W390KG Pressure10psi~15psi P.TypeOar blade or propeller Size350cm X 95cm X 15.5cm MaterialDrop stitch fabric, PVC, EVA, glue, D ring, braided strap, SBR 2.Portable plug-in electric integrated Propeller 3.Accessories N order to protect the ecological environment, it is strictly forbidden to throw away waste lithium batteries锛孴he waste batteries shall comply with government regulations and be delivered to qualified units or designated management departments for centralized disposal TransportationChina ISUP website:http://www.electric-supboards.com/sup/isup/