Description: Designed for sports and aviation enthusiasts, does not take much space and can be easily taken away. Specifications: SpO2 measurement range: 5%~99% SpO2 accuracy: +1% in the range of 90%~99%, +2% in the range of 70%~89%, other scope is not defined SpO2 Alarm range: Consistent with the display range, the set step length is 1% Pulse rate range: 30 bpm~250 bpm Pulse rate accuracy: ±1 bpm Pulse rate Alarm range: Consistent with the display range, the set step length is 5 bpm Data update cycle: 0.25s~2s.