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Product model: B57 smart bracelet Chip NRF52832 Bluetooth: BT4.0 Compatible system: Android 4.4 and above, 1OS 9.0 or above Waterproof ratin IP67 Screen: 1.3 inch IPS color Resolution: 240*240 Touch Single touch Battery: 180 mAh Chargin Magnetic charging Charging time: about 15H Standby: 15 days or so Working time: 7 days or so 12 Bracelet material PC case + plastic case 13. Product size: about 48.9*34.5*11.7mm/.92*1.350.46in APP support languages Ukrainian, Russian, German, Italian, Japanese, French, Simplified Chinese, Traditional Chinese, English, Portuguese Spanish, Arabic, Korea