DescriptionXiaomi Mi Band 4 Smart Bracelet satisfies your daily needs. Whether you are a sport enthusiast or concentrate more on a healthier lifestyle, it works perfectly to help you achieve your fitness goals. Pedometer, sleep monitor, and reminders are easily accessible, so you can visualize your progress you've made by using the App. A variety of custom dials make it easy to respond to every scene and easily express every mood.Main Features● The fitness band uses Bluetooth 5.0 BLE which offers an improved range, connectivity speed and efficiency ● 0.95 inch AMOLED colour display that pushes 120 x 240 pixels resolution on an AMOLED screen ● 5ATM water resistant rating ( up to 50 meters ) ● The fitness band uses Bluetooth 5.0 BLE which offers an improved range, connectivity speed and efficiency ● Come with a 135mAh battery and it is rated to last more than 20 days on a single charge● Support for Alipay offline payment● Focus on your health,built-in heart rate record, sleep monitor, sedentary reminder, etc. ● 135mAh battery capacity offers up to 20 days standby timeBrand: Xiaomi Bluetooth Version: Bluetooth 5.0 Waterproof / Water-Resistant: Yes Operating mode: Touch Screen Compatible OS: Android,IOSType of battery: Li-ion Battery Battery Capacity: 135mAh Charging Time: About 120minsFunctions: Call reminder,Message,Sedentary reminder APP: MiFitShape of the dial: Arch Case material: PC Band material: TPU Band size: 3.2 x 1.79 x 1.2cm Dial size: 247 x 18mm Wearable length: 155 - 216mmPackage weight: 0.144 kg Product size (L x W x H): 24.70 x 1.79 x 1.20 cm / 9.72 x 0.7 x 0.47 inches Package size (L x W x H): 9.00 x 9.00 x 4.10 cm / 3.54 x 3.54 x 1.61 inchesPackage Contents: 1 x Smart Bracelet, 1 x USB Charger