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Smartwatches typically offer more features than fitness trackers, including the ability to run apps, receive notifications, and sometimes make calls. Fitness trackers focus primarily on health and activity tracking with longer battery life but fewer smart features. Many modern smartwatches now include comprehensive fitness tracking capabilities.

Most smartwatches require initial setup with a smartphone, but some models with cellular connectivity can operate independently for calls, messages, and apps. Basic functions like telling time, fitness tracking, and some pre-installed apps may work without a phone, but full functionality typically requires pairing with a smartphone.

Smartwatch health metrics are generally accurate for personal tracking but shouldn't replace medical devices. Heart rate monitors are typically within 5-10% of medical-grade equipment. Features like ECG and blood oxygen monitoring on premium models can be quite accurate, but always consult a doctor for medical concerns rather than relying solely on smartwatch data.

Battery life varies significantly by model and usage. Generally, fitness-focused watches from brands like Garmin, Coros, and Amazfit offer the longest battery life (often 1-4 weeks). Hybrid smartwatches with e-ink displays can last months. Full-featured smartwatches like Apple Watch or Wear OS devices typically last 1-3 days between charges.

Most modern smartwatches are water-resistant to some degree, with many rated for swimming (typically 5ATM or 50 meters water resistance). However, "waterproof" is a misnomer - water resistance ratings indicate pressure resistance, not necessarily depth or duration. Avoid hot water, soaps, and pressing buttons underwater. Check your specific model's rating before swimming or diving.

Many smartwatches allow you to answer calls directly from your wrist if they have a speaker and microphone. Some require your phone to be nearby via Bluetooth, while cellular models can make/receive calls independently. The call quality varies by model - watches with better speakers and noise reduction provide clearer audio. Some watches only let you reject calls or send quick replies.