Waterproof IP68 to 330 feet (100m) Drop-proof MIL-STD 810G 6.6ft (2m) Snow / Dirt / Sand proof 360 ° total protection True Sound Acoustic Technology¢ Charge watch through case Measure heart rate through case Tactical side button Patented rotating crown dial Raised bezel protects the screen Includes a hypoallergenic silicone band Does not support Apple's ECG/EKG Easy to install AWARD-WINNING DESIGN - The Catalyst case for 44mm Apple Watch Series 4 is fully compatible with the 44mm Apple Watch Series 5*. This is the worlds first and only Apple Watch Case that guarantees total protection up to 330ft underwater.WATERPROOF PROTECTION - The case has a waterproof rating of IP68 that allows you to dive as deep as 330ft (100m).RESISTANCE TO DROPS -This resilient Catalyst Apple Watch 44mm case exceeds military standards for shocks & drops up to 6.6ft (2m). The material is rugged, shock-resistant and scratch-proof. In additionFULL FUNCTIONALITY - Made with maximum precision, the case keep