Sleep monitoring storage memory function: (1) Recording form: the sleep record is recorded as a waveform function; (2) Recording time: waveform data of up to 8 hours can be recorded; (3) Storage method: It is stored in a memory manner, which is convenient for users to check the data by themselves; (4) Data use: The data can be provided to a professional doctor for effective sleep disorder treatment; (5) Operation mode: In the Page 3 operation setting, the battery will flash ERC continuously, indicating that the sleep recording function has been successfully opened; (6) Note: If testing the sleep monitoring function, at least three minutes or more; (7) Data embodiment: wave mode, data mode; Product features: SpO2 range: 36% - 100% SpO2 accuracy: 2% SpO2 resolution: 1% PR range: 30 - 250 bpm PR accuracy: 1 bpm PR resolution: 1 bpm PI range: 0.2%-30% PI accuracy: ±0.1% PI resolution: 1% Screen: OLED screen; Packing size: 6.5*3*3cm; Screen material: OLED display; Product list: oximeter*1 manual*1 hand strap*1