The batteries need to be installed when updating the C4 firmware. Please be aware: no normal batteries!!! The need to be rechargeable.
The SD card slot can be used to save different measures. I have not ever used it. And many of the cheap China clones do not even have that slot. When trying to insert a memory card it just disappears in the housing :-(
Removing is only possible after the C4 is opened.
The SD card slot can be used to save different measures. I have not ever used it. And many of the cheap China clones do not even have that slot. When trying to insert a memory card it just disappears in the housing :-(
Removing is only possible after the C4 is opened.