The Fitbit One Black Wireless Bluetooth Activity & Sleep Tracker is a versatile fitness technology device designed for both indoor and outdoor activities. With features such as step counting, sleep tracking, calorie tracking, and distance tracking, it helps users monitor their daily fitness goals accurately. The device runs on batteries and has a battery life of more than 7 days, ensuring uninterrupted monitoring of your activity levels. The sleek black design and compact size make it ideal for unisex adults who are looking to track their walking progress in English language. The included clip allows for easy attachment to your clothing for convenience.