Garmin 4.0 vivo fit tracker. Originally $179 This is new. Adjustable Band. Never used Features always on customizable color display and 1 plus year battery life; no charging necessary. Safe for swimming and showering.Physical size : Circumference (small/medium): 122-188 mm. Circumference (large): 148-215 mm.Supported Application:Heart Rate Monitor,Sleep Monitor,Weather,Alarm. Connectivity technology:Bluetooth Smart, ANT+. Wireless comm standard:Bluetooth Tracks steps, distance and calories burned, monitors sleep and provides a personalized daily step goal (heart rate monitoring not available on this product) Periodically syncs to Garmin Connect, where you can save, plan and share your activities, get involved in social challenges and more Garmin Move IQ feature automatically detects activity and classifies activity type on Garmin Connect. Smartphone compatibility is iphone and android Width is 0.75 inch and thickness is 0.37 inch. Circumference for large is 5.83 to 8.46 inch and Circumference for regular is 4.80 to 7.40 inch. Display size is 0.43 x 0.43 in inches and Display resolution is 88 x 88 pixels