These came from two Bluetooth speakers and Google search yielded no results. Both of those speakers have AUX in, TF/SD card playback capability (MP3/WAV, 44100Hz maximum, FAT32), and both of them have messages for Bluetooth search, pair, unpair/connection lost, AUX mode and low battery warning ("the other side hung up" tone from the common telephone line)
Details:
Both speakers contain TF/SD card slot, a microphone and an audio jack, with one having two-position switch and "jog wheel" and another having one-position power switch, switched audio jack and a capacitive touch sensor array with anonymous chip on it.
Both speakers have atrocious voice announcements which plays at maximum volume, with one with longer package yelling "ENTER TO BLUETOOTH", "ENTER AUX IN PLAYIN", "BLUETOOTH CONNECTED", and "BLUETOOTH CANCELED" in Chinese accent and QFN package one yelling "BLUE TOOTH MODE", "AUDIO IN PUT", "*stolen notification sound from a phone manufacturer Oppo*", "*stolen sound from Windows 3.1 boot sequence of all places*" in Chinese accent. First one has distinctive compression noise or noise suppression artifact in the background, while the QFN one has what sounds like PWM whine.
I have seen what looks like Pi logo on the longer chip on many other speakers, but I can't figure out what company makes these things.
The text reads: "AC1749AP16296-5B4" and this board has round pads with texts: "DP RED DM DAT CLK CMD 3V3"
This chip runs on 24MHz crystal oscillator.
The text reads:
"B6THK16094.1"
"1414ARZ"
It has a place for a crystal oscillator but is not fitted with one (two holes near the ceramic capacitor)
The text reads
"CW6637M"
"1414D"
"CSTH310052.1"
This chip runs on 25MHz crystal oscillator.
The board has 25D40 EEPROM chip, probably for storing configurations, last connected Bluetooth device name and some sound samples, since all sound samples last for less than 3 seconds each.
Like Polaroid feather-light fabric Bluetooth speaker, both of them have some problem with enabling the amplifier at the right timing.
