Horn Siren,Alarm Horn,Car horn, horn speaker 1.Built-in audio speaker 2.Support 10W audio output 3.built-in SPI-flash ... Re-programmable Horn Siren,Alarm Horn,Car horn, horn speaker FeaturesAudio format : wav , 16bit, mono sampling rate supports ... 4. Negative side of PCB 5. Download connection 6. Test kit Remark: 2.GND wireNo.WIRECONNECTION1Black wireGND2Red wirePositive power supply 5 ...