Recovered from e-waste.    When found it was fitted with a replacement battery, but the old battery was still present as was the dock.  When powered up the battery indicator LED lights orange and the AUX light is white. The device is otherwise unresponsive to any keypress and does not make any sounds. Internally it looks clean, but the STM32 processor is very hot to touch when the battery is connected.  I've removed the battery from the speaker housing

Included the the package is:-

Suitable for spares or repairs, if you have the know how!