About this 3D model

- 2 batteries (this is the maker's mind) - Bluetooth amplifier XH-A158 (Manual volume adjustment is convenient to use) - 2 inch speaker - Charging module TP4056 - Direct battery connection - Circular switch KCD1-105 (It is 16 pi.) - Assembling Countersunk screw 8 pieces of M3 * 8~10L / 9EA - Speaker fixing screwRecommended for lengths of about 8 mm or less in size of M3 / 8 required https://blog.naver.com/ss5258/221994781129