| Basic Parameter | Model name | HK21 |
| Color | Black, Silver, Gold |
| Main function | BT calling, voice control, information screen always on, Alipay offline payment, stock market, games, blood sugar, NFC, stress test, breathing training, calendar, world clock, computer, password unlocking, custom dial, weather forecast, music control, step counting, heart rate, sleep, sedentary, mileage, blood oxygen, blood pressure, search, calories, message push. |
| | Cpu | JL7012F6 |
| APP/APK | CO-FIT |
| System | Android 4.4 or above, IOS 9.0 or above |
| Memory | RAM:640KB,ROM:2MB Flash:64M |
| Screen size | 2.01-inch AMOLED 240*296 |
| Screen Type | Full screen touch |
| Connection parameter | Bluetooth | BT5.3 |
| NFC | Support |
| Sensor | G-sensor | Support |
| Heart rate sensor | LC11S |
| Battery | Type | Lithium polymer |
| Capacity | 250mAh |
| Charging mode | Magnetic charging |
| Software features | CO-FIT | Massive dial download, upload photos, step counting, heart rate, sleep, sedentary, mileage, blood oxygen, blood pressure, mobile search, calories, Bluetooth, information, wechat, QQ and other push |
| Search function, alarm setting, water drinking reminder, gesture intelligent control, do not disturb mode, reminder mode |
| Phone, SMS, wechat, QQ, Facebook, twitter, instagram, Skype, WhatsApp, line, kakao talk, others |
| Supported languages: Danish, Ukrainian, Urdu, Russian, Hungarian, Indonesian, Türkiye, Bengali, Hebrew, Greek, German, Italian, Czech, Japanese, French, Polish, Thai, Swedish, Simplified Chinese, Traditional Chinese, Finnish, English, Dutch, Portuguese, Spanish, Vietnamese, Arabic, Korean |
