Chipset: RTL8762 ESF APP: QRing Compatible System: For Android 5.1 or above, IOS 8.0or above FLASH memory: RAM104KB FLASH 512KB BT: 5.2 Sensor: ST LIS2DOCTR Heart Rate: Vcare VC30F-S Battery: 15mAh / 18mAh Waterproof Level: 5ATM Major Function Daily Activity: Steps, Distance, Calorie Counting Health management: heart rate, skin temperature measurement, blood oxygen saturation, HRV heart rate variability, stress, sleep tracking Indicator light: message alert, charging status Touch function: music control, short video control Other functions: remote photo, NFC, female physiological reminder, multi-sport mode Software Feature Steps, sleep, heart rate, workout data recording Health monitoring, pressure, blood oxygen measurement Multiple exercise modes, photo taking, message alerts Supported languages: Danish, Ukrainian, Russian, Croatian, Hungarian, Hindi, Indonesian, Turkish, Hebrew, Greek, German, Italian, Latvian, Czech, Slovak, Slovenian, Japanese, French, Polish, Thai, Estonian, Swedish, Lithuanian, Simplified Chinese, Traditional Chinese, Romanian, English, Dutch, Portuguese, Spanish, Vietnamese, Arabic, Korean, Malay Specifications: 9 / 10 Color: Black Material: plastic Package Contents: 1 * Ring Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.