The Catalyst Impact Protection case is designed with a grippy rubber bumper and the digital crown button. They are drop proof to 9.9 ft (3m) and dual layer of protection. This design has added impact protection from an innovative impact truss cushioning system combined with a proprietary rubber polymer blend with a drop specification to 9.9ft (3m) and is drop tested to military standards. All of the features of the Apple Watch remain fully functional including Wi-Fi, Bluetooth, LTE, Siri, Digital Crown, Side Button, Heart Rate Sensor and Magnetic Charging.