Sound Units

Micro SD TF card reader module SPI interface with chip level conversion
Support Micro SD card, Micro SDHC card (high speed card)
board level conversion circuit, namely the interface level for 5V or 3.3V
power supply is 4.5V ~ 5.5V, 3.3V voltage regulator circuit board
The communication interface is a standard SPI interface
M2 screw positioning holes for easy installation

DC 3-5V Active Buzzer Module Audible Visual Alarm Module