ViATOM Bluetooth Pulse Oximeter Approved UK Built-in Offline Storage, Oxygen Monitor finger Adults for Heart Rate Blood Oxygen Saturation Includes Carrycase and Lanyard, Free APP

Built-in Offline Storage: This oximeter can store up to 12 sets of SpO2 and heart rate data without the need for a Bluetooth connection, allowing you to see how well you are doing in more time.
Data Management: Data can be synchronized on FREE app, oxygen value, pulse rate can be easily recorded and analyzed on your mobile phone any time any where.
Beeping Notification: During the measurement process, if the oxygen level or PR exceeds the preset threshold, the device will automatically beep, and the value will flash on the screen at the same time.