This is a Garmin Vivosmart 4 watch/ activity tracker. Worn only a few times. Excellent working condition. Size S-M in the color gray. PHYSICAL SIZE Small/medium: 15 x 10.5 x 197 mm Fits wrists with a circumference of 122-188 mm Large: 15 x 10.5 x 223 mm Fits wrists with a circumference of 148-215 mm WEIGHT Small/medium: 16.5 g Large: 17.1 g DISPLAY SIZE 0.26" x 0.70" (6.6 mm x 17.7 mm) DISPLAY RESOLUTION 48 x 128 pixels BATTERY LIFE up to 7 days (excluding pulse ox sleep tracking) CHARGING METHOD Garmin proprietary clip charger MEMORY/HISTORY 7 timed activities, 14 days of activity tracking data