The eufy Breast Pump has a low-battery alert feature for the user's convenience. You can easily tell if the Breast Pump’s battery is low by the following methods:

• If the battery indicator displays a red light when any button on the hub is pressed, the battery is below 20%.
• If the battery indicator flashes a red light, the battery is below 10% and the Breast Pump needs to be recharged immediately. 
• You can also check the battery level by using the app.