Bluetooth 4.0 connectivity, stable signals and low power consumption Large color screen of 1.3 inches, with IP67 water resistance level, sweat-proof and durable for use Health monitoring: heart rate measurement, blood pressure measurement and sleep monitoring, body temperature monitoring Never missing massage and phone calling, it can save massage records, like Facebook, Twitter, Instagram, LinkedIn, etc With built-in 170mAh battery, standby time up to 20 days Widely compatible with Android 5.0 or above and iOS 8.0 or above smartphones Great for sport, old people, boy, girl, suitable for most people who need to monitor health condition Specification: Screen size: 1.3and 39 and 39 Waterproof: IP67 Battery capacity: 170mAh Standby time: 20 days Working time: 5-7 days System requirements: Support Android 5.0 and above, Apple IOS 8.0 or above Bracelet display language: Simplified Chinese, English, Thai, Russian, Spanish, Portuguese, Traditional Chinese, Turkish Bracelet push language: Chinese Simplified, English, Traditional Chinese, Japanese, French, German, Russian, Italian, Portuguese , Spanish, Thai, Greek, Turkish, Dutch APP language: Chinese Simplified, English, Traditional Chinese, Japanese, French, German, Russian, Spanish, Portuguese, Thai, Korean, Turkish