I built a small DIY music box as a gift and I will be flying domestically within the US with it in my carry-on. It has standard arduino components (pictures attached) but the ones I'm worried about are the 3.7V 2000mAh Li-ion battery (7.4 Wh), and the magnet in the speaker.
All components: Teensy 4.0, audio shield, MAX98306 amplifier, OLED display, 4 ohm speaker, pushbuttons, potentiometer, rechargeable 3.7V 2000mAh Li-ion battery, polulu switch, powerboost 1000c.
The box is 3D printed, and all the wiring is internal. The front lid is attached using 6 screws, and can be detached using the screwdriver if needed.
I have photos of the circuit inside (as shown in this post) and the box can play songs when i push the power button.
I am looking for any advice regarding traveling with such a homemade electronics project. Will TSA ask to open it? Should i bring the screwdriver to do so? The battery being 7.4Wh is within limits but how will TSA know the exact voltage? Should I print out any description? Any advice to make the process smoother would be appreciated! Thank you so much 😄