Made from a custom high-performance fluoroelastomer with compression-molded perforations for breathability, the Nike Sport Band is durable and strong, yet surprisingly soft. The smooth, dense material drapes elegantly across your wrist and feels comfortable next to your skin. An innovative pin-and-tuck closure ensures a clean fit. 40mm: S/M & M/L bands fit 130-200mm wrists.

Fundamentally redesigned and reengineered. The largest Apple Watch display yet. Built-in electrical heart sensor. New Digital Crown with haptic feedback. Low and high heart rate notifications. Fall detection and Emergency SOS. New Breathe watch faces. Automatic workout detection. New yoga and hiking workouts. Advanced features for runners like cadence and pace alerts. New head-to-head competitions. Activity sharing with friends. Personalized coaching. Monthly challenges and achievement awards. Built-in cellular~ lets you use Walkie-Talkie, make phone calls, and send messages. Stream Apple Music~ and Apple Podcasts. And use Siri in all-new ways - even while you're away from your phone. With Apple Watch Series 4, you can do it all with just your watch.

Make sure you always have batteries on hand to power your keyboard, mouse or other device with this battery charger and 6 rechargeable AA NiMH batteries. The wall outlet charger design lets you charge 2 batteries simultaneously for convenient use.