The RAM Tough-Charge Wireless is a patented, universal waterproof wireless charging cradle for phones. As part of the spring-loaded RAM Tough-Charge family, this cradle allows for single-handed placement and removal of your phone while taking advantage of Qi wireless phone charging.; Waterproof Qi wireless phone charging cradle features spring-loaded RAM X-Grip technology and 10W maximum output Kit for vehicles includes wireless cradle and B size diamond ball base; attaches to B size double socket arms Made of powder-coated, marine-grade aluminum, stainless steel components, and high-strength composite for durability and reliability Holder dimensions: Width Range: 2.375" - 3.25", Depth Range: .875" max