Switch up your shade with Fitbit Alta HR classic accessory bands. Comfortable, durable and water resistant, this band can go wherever you do - from outdoor jogs to rainy communes. Using Bluetooth LE wireless technology, Fitbit Alta HR sends smartphone notifications and syncs automatically to computers and 200+ mobile devices. Smartphone notifications may require Android 5.0+. Syncing range: Up to 30 feet Syncing requires Bluetooth LE and Internet connection. Windows 10 computers that do not have Bluetooth LE will need a wireless sync dongle in order to sync. Syncs with Mac OS X 10.6 and up, iPhone 4S and later, iPad 3 gen. and later, Android 4.4 and later, and Windows 10 devices.. The Fitbit Alta HR wristband is made of a flexible, durable elastomer material similar to that used in many sports watches. The tracker is made with surgical-grade stainless steel, and the buckle is made with aluminum. The Alta HR gunmetal tracker is made with premium PVD plating, and the rose gold tracker is plated with 22k rose gold. The Fitbit Ionic perforated leather band is not intended for high intensity workouts. If the band gets wet or dirty we recommend using a non-abrasive, lint-free cloth. If needed, you can lightly dampen the cloth with water and let the band air dry. Due to the natural characteristics of genuine leather, each piece will have a distinct variation in color and texture. To maintain the life of your leather band, limit direct exposure to sunlight and moisture, which may cause fading over time. For light-colored leather accessory bands, minimize direct contact with dark-colored clothing, as color transfer may occur. The Fitbit Ionic perforated leather band is not sweat or water-resistant. We recommend limited to no contact with moisture to reduce discoloration/damage to the band. The Fitbit Ionic perforated leather band is made of Horween leather and includes an aluminium buckle. Horween leather is a high-quality leather hand-crafted and tanned in Chicago through traditional tanning techniques. Because this band is made from natural materials, it will mold to your wrist and develop an aged patina finish over time.