The Amazfit T-Rex Pro is a titanic combination of practicality, strength and comfort. The shape of the Amazfit T-Rex Pro is tough and solid with distinct angles. Having passed 15 military-grade tests1, the watch can battle with you through hot deserts, humid rainforests and polar glaciers. Witness endurance that braves the elements with ease.# Compatibility: This watch is compatible with both iOS and Android devices. Depth: 13.5 MM The Amazfit T-Rex Pro is a titanic combination of practicality, strength and comfort. The four Global Navigation Satellite Systems supported offer rapid positioning with a high-degree of accuracy. With a 10 ATM grade, T-Rex Pro is water-resistant to a depth of up to 100 meters, so you can surf, swim, or explore the mysterious underwater world. T-Rex Pro features over 100 sports modes, and can be used to monitor critical data such as workout heart rate, distance traveled and calories burned T-Rex Pro serves as your personal sleep assistant. The watch can recognize different sleep states - such as the light, deep and REM sleep stages Height: 47.7 MM Width: 47.7 MM