Key Features: Compatibility: Works with Apple iPhone 4, 4S, 5, 5s and 5c, iPod Touch (3rd and 4th Gen) and most Android devices with OS 2.3 or later. Bluetooth 4.0 Technology: Pair your compatible Bluetooth device to view text messages, e-mails, caller ID, accept and reject calls, control your music and more. E-paper Display: View crisp, clear images and text whether you're indoors or outdoors, even in direct sunlight. And with a scratch and shatter resistant lens, the Pebble Smart Watch is built to last. LED Back-light: Perfect for viewing content in the dark so you can always see what's going on. Waterproof: Wear the Smart Watch while you're working out, swimming, or in the shower without worrying about water damage. Fitness Tracking: Track steps taken, distance traveled and calories burned to help stay on top of your health. Silent alarm: Wake up to a vibrating alarm, so you don't disturb your partner. Downloadable Watch Faces and Apps: Personalize your Smart Watch with hundreds of watch faces, and download apps from thousands of developers for everything from music to sports and much more! Long lasting Battery: Built-in Lithium-ion Polymer battery lasts about 5-7 days before needing a charge. . Phone Compatibility: iPhone 4 (ATT), iPhone 4S (ATT), iPhone 4 (Verizon), iPhone 4S (Verizon), iPhone 4S (Sprint), iPhone 4 (Sprint), iPhone 5, iPhone 5S, iPhone 5C, iPod touch (4th generation), iPod touch (3rd generation), and Android 2.3 or later devices.