MIOPS FLEX comes with a rechargeable and replaceable battery. The battery will be charged when you connect MIOPS FLEX to a USB power source. You can use your smartphone's USB charger for this purpose.
Warning: Using MIOPS FLEX with other type of battery and power source may harm your device.
Important Notice: Do not modify or format the SD card. Otherwise, FLEX will become unusable. If you encounter such an issue, please execute SD card recovery process given below.
https://help.miops.com/hc/en-us/articles/4407840321042-FLEX-SD-Card-Recovery-Process