Watch Series 4 40 mm

The Apple Watch Series 4 introduced a significant redesign with larger displays, enhanced input capabilities, more powerful internals, and advanced sensors, including a new accelerometer and gyroscope for fall detection and an electrical heart sensor. This particular model, the Apple Watch Series 4 (Aluminum, GPS, 40 mm), lacks cellular connectivity and requires an iPhone 5s or later with iOS 12+ for most functions. It is controlled by a Digital Crown with haptic feedback. The 40 mm GPS model features a 324x394 LTPO OLED screen with Ion-X glass in an aluminum case, with a back made of ceramic and sapphire crystal. Battery life is estimated at up to 18 hours. Six configurations were available, combining silver, gold, or Space Gray aluminum cases with a choice of Sport Band or Sport Loop.

The Series 4 marked a revolutionary leap in Apple Watch design and functionality, with reviewers universally praising the dramatically larger display that finally made the device feel spacious and modern. The introduction of advanced health sensors, particularly ECG capability and fall detection, elevated the device from a convenient accessory to a potentially life-saving medical tool that garnered FDA approval. Users consistently reported that the performance improvements made the watch feel blazingly fast compared to previous generations, with app launches happening almost instantaneously and interactions becoming genuinely fluid for the first time.