The Garmin Dynastream USB ANT+ Stick is a black dongle wireless receiver designed for smartwatch connectivity. This model, #3797A-2021, is made of plastic and is compatible with Windows and macOS operating systems. It features wireless technology and is ideal for running and jogging activities, making it a convenient accessory for fitness enthusiasts. With its USB power source and English language settings, this Garmin USB ANT Stick is a versatile and reliable tool for those looking to enhance their fitness tracking experience.