About this 3D model

https://blog.naver.com/ss5258/222070253454 - 3 batteries Li-ion 18650(this is the maker's mind) - Bluetooth amplifier XH-A158 (Manual volume adjustment is convenient to use) - 2 inch speaker - Charging module TP4056 - Circular switch KCD1-105 (It is 16 pi.) - Assembling Countersunk screw of M3 * 8~10L / 9EA - Speaker fixing screwRecommended for lengths of about 8 mm or less in size of M3 / 8 required