Features: Brand new and high quality Monitor your heart rate accurately with this heart rate monitor chest strap, providing real timing data for tracking fitness progress. This heart rate monitor chest strap is designing for comfort and durability, ensuring a comfortable during workouts. Suitable for individuals who want to track their heart rate during physical exercises like running and outdoor activity. Stay connecting to your smartphone app, allowing you to record and analyze heart rate data for better understanding of your body's performances. Use this heart rate monitor chest strap in various sports and daily activity to keep tracking of your heart rate. Specifications: Materials: Silicone+Fiber Color: Black Package Weight: about.32g Two Hole Distance: about.45mm/1.77in Package Includes: 1Pc Heart Rate Monitor Strap note: Please allow 1-3mm error due to manual measurement. Please make sures you not mind before your bid. Due to the differences between different monitors, the picture may not reflect the actual colorful of the item. Thanks!