Stylish Design: The W5SV features a sleek and design with a comfortable silicone band LED Display: Equipped with a clear LED 7-segment display for easy viewing of time and notifications Vibrating Alarm: Set alarms and receive wake-up alerts through gentle vibrations, ensuring a peaceful start to your day Sleep Monitoring: Track your sleep patterns and gain insights into your sleep quality for improved rest Long Battery Life: With a 40mAh battery, enjoy up to 45 days of standby time on a single charge, making it convenient for everyday use Durable and Lightweight: Weighing only 18g and designed for longevity with over 300 charge-discharge cycles, it's the perfect companion for an active lifestyle Specifications: Model: W5SV Material: Silicone Display: LED 7-segment display Charging: Micro USB port Voltage: DC 4.5-5.5V  Battery capacity: 40mAh Sleep current: 25uA Standby time: 45days Atmospheric pressure: m860hPa~1060hPa Battery life: > 300 times charge-discharge cycles  Weight: 18g