The OnePlus Watch 4 is a smartwatch designed to serve both as a fitness tracker and a companion device for smartphones. It features a lightweight 43-gram case and an 11 mm thickness, making it comfortable for everyday wear. The green Evergreen Titanium version, currently on sale on AliExpress, is available at a discounted price of 212.16 €, down from the original 289.82 €. The promotion runs until September 7, 2026, at 23:59, and a 18 € discount code brings the final price to 194.16 €. The titanium case is both durable and light, allowing the watch to be worn comfortably in various situations. It also meets the MIL-STD-810H standard, meaning it is built to resist harsh conditions, including exposure to seawater. One of the standout features of the OnePlus Watch 4 is its battery life. Powered by two chips — the Snapdragon W5 and the BES2800 — the watch can adapt its performance to conserve energy. OnePlus claims up to 5 days of use in smart mode and up to 16 days in power-saving mode. This means users won’t need to recharge the watch every day, unlike some other smartwatches that drain power more quickly. The Watch 4 also offers comprehensive sports tracking, supporting over 100 different sports modes. Eleven of these activities, such as running, cycling, hiking, and swimming, include a professional mode that provides detailed metrics like pace, running power, and lactate threshold. Beyond fitness, the watch includes a "well-being overview" that gives users a 60-second summary of their cardiovascular health, sleep quality, and overall well-being. While this feature is not a substitute for professional medical advice, it can encourage users to consult a healthcare provider if needed. The OnePlus Watch 4 connects with Google’s Wear OS and the OHealth app, and it works with Android smartphones running version 9.0 or later that have access to Google services. It also integrates with Google Gemini, allowing users to use voice commands to send messages, request assistance, or perform tasks without needing their phone. However, some features may depend on the specific Android phone and the user’s location. For Android users seeking a smartwatch that can last several days on a single charge while offering advanced fitness tracking, the OnePlus Watch 4 offers a compelling balance of features and price, especially with the current discounts available on AliExpress.