Hi there, this Arduino Nano V3 case provides plenty of space underneath the actual Arduino. In my case this free space was used to hide a HC05 Bluetooth module. To close the case just screw the top and bottom part with a M3 screw together. The Fusion360 file is included, if you want to modify this design. This case does not include a battery department. For a case with battery department, check out my other design: #################################### Important: In order to close the case the Arduino ICSP Header has to be desoldered or resoldered the other way around.