How do I charge my Frontier X?
Connect the device to any regular micro-USB charger using the micro-USB port located on the device. Your device should charge fully in two hours. You can view the battery level on the device screen while the device is charging. Once the battery level crosses 95 percent, the device is sufficiently charged, and you can disconnect from the charger. Ensure that your Frontier X is charged to at least 20 percent before downloading your ECG data over WiFi. Other functions can be used until the battery level reaches 10 percent.