۱٫۲٫۵V to 5.5V operation from a single supply ,and damaged upper 5.5V.
۲٫A 5V/1A DC adapter is recommended to supply the module.
۳٫The circuit will be damaged if the power polarity is oppsite.
۴٫۴ Ω ۳W Speaker is recommended
۵٫With mute fuction, Mute by high level on MUTE PIN and play by low level, Low level is default by a pull-down resister.
۶٫The module is effective for 0.5V to1V audio signal ;a pre- Amplifier will be needed, if the signal is small.