I purchased this even I knew that it did not work, solely for the purpose of checking inside.
I already destroyed four similar no brand (generic) China made Wireless (Bluetooth) Speakers. So I am a bit familiar with the inside.
1. JL or JC logo (highlu likely JL or Jie Li (Technology)
https://www.hkstp.org/en/directory-list/Details/jieli-technology-hong-kong-co-limited
Part No. AC1513CF9J0T. 1- 06BT - Bluetooth + MP3 + etc function
I have found this JL brand IC before and introduced in China made Wireless Speakers - 2.
28 pin IC: ACCFCV56.1-07ABT
2. RDA5876 (RDA brand) - Bluetooth and FM Radio Chip
(RDA was purchased by a Chinese company called "Tsinghua Unigroup")
I cannot find radio function in this mini speaker.
I have found this RDA brand IC before and introduced in China made Wireless Speakers - 2.
RDA5876: I found the spec of RDA5876P - SINGLE CHIP FOR BLUETOOTH & FM RADIO TUNE
3. 25080xxxxxx with white paint (this white paint may have some meanings) - Flash memory
4. KDC8002 - Audio Amp KDC brand cannot be identified.
5. L 26.000MHz Oscillator
6. One <potentiometer + switch> like mechanical device (which seems broken) is connected to this Audio Amp.
7. Slide switch
8. TF (SD) card connector
9. LED
10. Microphone
11. 4 Ohm 3W speaker
12. Li-Ion Battery still charged (showing 1.7V) - surprised me. Then what's wrong with this mini speaker.
sptt
