The Smart Band M7 Black Case with Black Strap is a stylish and functional fitness tracker that offers a range of features including a blood oxygen sensor, AMOLED display, and heart rate monitor. Made from silicone, this smart band is comfortable to wear and waterproof, making it suitable for a variety of activities. Compatible with iOS and Android operating systems, this unlocked device also includes an accelerometer for added functionality. The sleek black design and compact 20mm case size make it a versatile accessory for those looking to track their health and fitness goals.