Sound Units

4x Active Buzzer 5v-12v Magnetic 12*9.5mm

Mini Horn Alarm Siren 105db Sound Alarm DC 12V Wired Indoor Siren for Home House Alarm System

Speaker 0.5watt 8ohm + Power Amplifier Music Player Module
Size: 34 x 21mm
Fixed hole: 3mm
Pitch: 15mm
Speaker power: 0.5W / 8Ω
Speaker diameter: 50mm
Amplifier chip: LM386
Voltage: 5V

Mini MP3 Player Audio Voice Module TF Card U Disk Board for DFPlayer Audio Voice Music Module
Supports sampling rates (KHz): 8/11.025/12/16/22.05/24/32/44.1/48
MP3 Player Audio Voice Module

Speaker small magnetic speaker 3W 4R 3 W 4 ohm diameter 36MM thick 20MM cone magnetic

Speaker small magnetic speaker 1W 8R 1 W 8 ohm diameter 66MM thick 12.7MM cone magnetic

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