Microsoft Band 2 - Large Description Microsoft Band helps you live healthier by tracking your heart rate, exercise, calorie burn, and sleep quality, and helps you achieve more with email, text, and calendar alerts at a glance. Advanced sensors track data specific to running, biking, and golfing. Technology from Microsoft Health gives you actionable insights based on your data. Works with Windows Phone, Android, and iPhone. Features: Size Large fits wrists 7.3"-8.5" Continuous heart rate monitor tracks your heart rate, calorie burn, and sleep quality. Works with Windows Phone, Android and iPhone* Get email, text, calendar, and call alerts on the go Tracking for running, biking, golf, and more Product Details: Brand: Microsoft Color: Black Compatible Devices: iPhone 4, iPhone 5, iPhone 5S, iPhone 6, Samsung S4, Samsung S5, Samsung S6, Windows Phone 10, Windows Phone 8.3 See more Screen Size: 12.3 Inches Item Weight: 0.66 Pounds Battery Life: 48 Hours Product Dimensions: 4.81 x 4.8 x 1.67 inches Item Weight: 10.6 ounces Item model number: 4M5-00003 Batteries: 2 Lithium Ion batteries required. (included) Is Discontinued By Manufacturer: No OS: android, ios, windows Special features: Heart Rate Monitor Display technology: OLED Other display features: Wireless Human Interface Input: Buttons Form Factor: Wristband Color: Black Department: unisex-adult Manufacturer: Microsoft PC Date First Available: October 6, 2015