Used Fitbit charge2, 10inches in length. Water resistant and works with Aria Wi-Fi Smart Scale. Retails online for around $160 as I came across. Works great, just don't wear it anymore. Price is firm. PUREPULSE HEART RATE Continuous, automatic, wrist-based heart rate tracking without and uncomfortable chest strap. MULTI-SPORT TRACKING Easily record runs, biking, weights and more with real-time stats on display. CARDIO FITNESS LEVEL Get a better understanding of your fitness level and see how you can improve over time with a personalized Cardio Fitness Score. AUTO EXERCISE RECOGNITION SmartTrack automatically recognizes select exercises (running, biking, and more) and records them for you in the Fitbit app. GUIDED BREATHING SESSIONS Find moments of calm throughout your day with personalized guided breathing sessions based on your heart rate. ALL-DAY ACTIVITY TRACKING Track steps, distance, calories burned, floors climbed, active minutes and hourly activity. Condition: Good