The OnePlus Watch 4 in green is a smartwatch designed for both fitness tracking and daily wear. It features a 1.43-inch AMOLED display with a resolution of 466 x 466 pixels, protected by 2.5D curved glass. The watch case is made of stainless steel and has a diameter of 46 mm with a thickness of 12.4 mm. It offers up to 14 days of battery life under typical usage, with fast charging support via an included magnetic charger. The device is water-resistant to 5 ATM and IP68 rated, making it suitable for swimming and showering. Health monitoring includes a heart rate sensor, SpO2 sensor, sleep tracking, stress monitoring, and over 110 workout modes with automatic detection. Connectivity options include Bluetooth 5.2, Wi-Fi 802.11 b/g/n, GPS (with GLONASS, Galileo), and NFC for contactless payments. The watch runs on Wear OS by Google, allowing access to apps from the Google Play Store, and is compatible with smartphones running Android 8.0 or later. It comes with a silicone strap in green and supports notifications from calls, messages, and apps. The round display has a pixel density of 326 PPI and an always-on mode. The OnePlus Watch 4 weighs 47 g (without strap) and includes a microphone and speaker for taking calls. It also features a rotating crown for navigation.