Specifications of LX9300 Music Voice Module:
Voltage: 2.5V-4.5V
PCB board dimensions: 20mm*11mm
Module static working current: only a few µA
Instructions to Use LX9300 Music Voice Module:
The red wire of the battery box is positive, and the black wire is negative.
The speaker doesn't require you to tell apart the positive and negative ends. You can use a regular 4 ohm 0.25W, 0.5W, or passive buzzer.
Remember to use an NPN-type transistor, like S8050 or S9013.