【Aerospace-Grade DLC Titanium】This watch feels buoyant but is built to last, with its lightweight titanium case and tough-as-nails diamond-like carbon (DLC) coating which makes its surface twice as hard. 【Health Glance 2.0】Get a mini health report with 9 key indicators, including two new items, pulse wave arrhythmia analysis and sleep breathing awareness,as well as data from any connected body fat scale, and track changes across time with intuitive graphs and visual layouts. 【Standalone Calling at All Times】Staying in touch has never been so easy, now that you can make calls from the convenience of your wrist. Turn your watch into a stand-in for your phone with eSIM One Number, or give your watch a number of its own with eSIM Standalone Number. 【Durable Battery】Standard Mode: 4.5-day typical battery life, 3-day max. battery life (with AOD on)；Ultra-long Battery Life mode：12-day typical battery life，21-day max. battery life 【Compatible with iOS & Android】 HUAWEI WATCH 4 Pro Space Edition is compatible with both iOS and Android, for greater ease of use.