Key Highlights – Apple Watch Series 4 (44mm) 44mm LTPO OLED Retina Display – Larger, edge-to-edge display with curved corners ECG App – Records electrocardiogram from your wrist Fall Detection – Auto emergency call if you fall and don’t respond S4 Dual-Core Processor – 2× faster than Series 3 Improved Heart Sensors – Second-gen optical + electrical heart sensor GPS + Optional Cellular – Stay connected without your phone (cellular models) Water Resistant to 50m – Safe for swimming Up to 18-Hour Battery Life – All-day performance