Experience ultimate convenience with our lightweight, battery-included device boasting a remarkable battery life of over 250 hours. Designed for stability and low power consumption, it’s perfect for a variety of activities like ball games, swimming, running laps, people counting, and goods counting. Easily control sound settings by pressing the "+" button for 5 seconds to turn sounds on or off. Safety is prioritized with an accident protection feature – simply hold the power/reset switch for three seconds to turn off or reset the device. Compact, durable, and user-friendly, this device ensures consistent performance wherever you go.