LEMFO HK4 1.43 inch AMOLED Round Screen Smart Watch Supports Bluetooth Calls 1. Material: zinc alloy + tempered glass + silicone strap 2. Wristband size: total length 22cm, adjustable length 145-190mm 3. Chip: Jerry 7012A6S 4. Compatible systems: Android 4.4 and aboveiOS9.0 and above 5. Memory: RAM: 640KB, ROM: 2MB Flash: 128M 6. Screen size: 1.43 inches 7. Pixel: 466x466 8. Bluetooth version: BT5.3 9. Battery capacity: 260mAh 10. Charging method: wireless charging 11. Waterproof level: IP68 12. Charging time: about 2h 13. Battery life: about 5-7 days of use, 30 days of standby 14. Support English, Chinese Simplified, German, French, Spanish, Portuguese, Turkish, Arabic, Italian, Russian, Polish, Indonesian, Dutch, Czech, Hebrew, Thai, Greek , Japanese, Traditional Chinese, Romanian, Vietnamese 15. Support Bluetooth calls, blood oxygen, blood pressure, sleep monitoring 16. Support NFC, stress test, breathing training, calendar, world clock and other functions