The Fitbit ZIP is a wireless fitness activity tracker in black color, designed for indoor and outdoor activities. It measures heart rate, speed, time, distance, and calories, providing a comprehensive analysis of your fitness performance. With features like multi-sport tracking, wireless connectivity, and smartphone compatibility, this activity tracker is perfect for various activities such as gym training, weight lifting, yoga, and running. The Fitbit ZIP is lightweight at 6oz and comes with a wristband for easy wearing, making it a convenient and reliable tool for tracking and improving your fitness goals.