Features: Achieve precise rhythm control with our high accuracy swimming metronome, featuring a timing chip that ensures less than 0.1 seconds error per minutes for consistent frequency training in sports like swimming, running, and cycling. Constructed from IPX8 waterproof plastic and weighing only 20g, this lightweight frequency trainer offer easy portability and reliabled performances in any environment. Ideal for professional athletes, fitness enthusiasts, and swimming seeking dependable tools to enhances training efficiency and achieve good performances. Perfect for swimming , running workouts, and cycling routines, providing stable rhythm support in diverse scenarios such as pools, tracks, or outdoor trail. Enjoy versatile frequency modes and a long lasting rechargeable battery with up to 20 hours of use, making this waterproof sport gear essential for flexible and uninterrupted training . Specifications: Component: plastic Size:Approx.18x16cm/7.09x6.3inch Color:Yellow Waterproof design, suitable for swimming, running, cycling and other sports scenarios Usage scenarios: Swimming training | Running rhythm training | Cycling frequency adjustment Package Includes: 1pcs Waterproof Metronome note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you donot mind befores you order. 2.Due to the differences between different monitors, the picture may not reflect the actual color. Thanks for your understandings.