Bicycle boombox

I made this boombox in sizes which fit in standart bicycle's bottle holder. I have added spectrum on MSEQ7 which made years ago.
Boombox's parts list:
1. MP3 module
https://ru.aliexpress.com/item/5V-Slim-Mini-Size-DIY-MP3-KIT-WAV-MP3-Player-Audio-Decoding-Decoder-Module-Board-With/32594145649.html?spm=a2g0s.9042311.0.0.iR0kOQ
2. Bluetooth module BK8000L
http://s.click.aliexpress.com/e/iznH8JI
3. 3W amplifier
http://s.click.aliexpress.com/e/bMDpHKQ8
4. 3W 4 Ohm 40 mm speakers
http://s.click.aliexpress.com/e/zzaDZWo
5. Step UP module
http://s.click.aliexpress.com/e/bRHUw2ZK
6. 3-Way switch (got it from broken casette player)
7. 18650 Li-Ion element + holder
8. Spectrum indicator (i made it as improvisation but you can buy it, i think this fit well http://s.click.aliexpress.com/e/bIe1TRuM )
9. Charger plate
http://s.click.aliexpress.com/e/b0sQQrCU
10. Some M3 screws and glue

That tiny speakers not loud, but it still enough and it goes to hot in max volume. So