Fitbit Alta Smart Fitness Activity Tracker Small Black Water Resistant Sleep Monitor Condition GRADE B+ - Open Box Features Water Resistance: Alta is sweat, rain, splash proof. You can wear Alta in the shower, but we recommend rinsing and drying it afterwards because it's best for your skin if the band stays clean and dry. Battery life: lasts up to 5 days. Radio transceiver: Bluetooth 4.0 Syncs with Windows Vista and later, Mac OS X 10.6 and up, iPhone 4S and later, iPad 3 gen. and later, and leading Android and Windows devices Alta syncs automatically and wirelessly to computers and 200+ leading iOS, Android and Windows devices using Bluetooth 4.0 wireless technology. All-day Activity Tracking Reminders to Move Auto Sleep Tracking Clock and Silent Alarms Tap Display Call, Text and Calendar Alerts Rechargeable Wristband Long Battery Life: Up to 5 full days From the Manufacturer Buyer Protection is at our core. Our products include a 30-Day Warranty. If there's any issue with your order within 30 days of your purchase, please reach out to us and we will take care of it for you with a return, replacement or refund. We are confiden