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Color classification:: It is recommended to buy the flagship version. The flagship version is deeply waterproof, with more accurate heart rate and longer standby time. Ordinary version black standby for 1 day + without heart rate, ordinary version red standby for 1 day + without heart rate, ordinary version with dark blue standby for 1 day + without heart rate, upgraded version with red standby for 3 days, with heart rate and blood pressure, upgraded version with red standby for 3 days, with heart rate and blood pressure, upgraded version with dark blue standby for 3 days, with heart rate and blood pressure, and flagship version with heart rate and blood pressure Color standby 4 days + deep waterproof + heart rate and blood pressure flagship red standby 4 days + deep waterproof + heart rate and blood pressure flagship purple standby 4 days + deep waterproof + heart rate and blood pressure flagship version dark blue standby 4 days + deep waterproof + heart rate and blood pressure premium Wristband Black 1.3 inch anti falling screen + deep waterproof + color screen top edition Bracelet Red 1.3 inch anti falling screen + deep waterproof + color screen supreme Bracelet dark blue 1.3 inch anti falling large screen + deep waterproof + color screen