Calculate your way to the top of the class. Ideal for advanced high-school math and science classes.

Apple Watch Series 2 is a superior sports watch that measures your workouts with detailed customizable metrics. An advanced activity tracker that shows you how often you move, exercise, and stand, and lets you share your progress. A powerful health tool that helps you be more conscious of your overall well-being, starting with your heart rate. And an all-day assistant that provides instant access to the people, apps, and information you care about most. There are cases made from aluminum and stainless steel and a full range of interchangeable bands in a variety of styles, colors, and materials. All models run watchOS 3. Requires an iPhone 5 or later.

Keep outdoor parties going with this Altec mini life jacket Bluetooth speaker. The water-resistant design makes this device ideal for camping and beach trips, and the rechargeable battery delivers up to 16 hours of music. With its built-in microphone, this Altec mini life jacket Bluetooth speaker lets you take hands-free calls while you lounge poolside.

Dance to the music with this Altec BoomJacket speaker. It has a lithium-ion battery that delivers up to 50 hours of music on a single charge, and its Bluetooth connectivity lets you connect to your tablet, iPod or Android phone from up to 50 feet away. Listen to music outdoors with this water-resistant, shock-proof and floatable Altec BoomJacket speaker.