Meet fitbit sense—the advanced smartwatch that helps you tune in to your body and guides you toward better health. assess your heart for atrial fibrillation (afib) with a compatible ecg app right on your wrist, track & manage stress, better understand your sleep quality and even keep an eye on patterns in your skin temperature. plus, sense unlocks a 6-month free trial of personalized guidance and advanced insights from fitbit premium for new users.