WTV-S1 PIR Sensor Sound Module Built-in amplifier, can drive 0.5W/8ohm speaker directly. Adjustable volume,good sound quanlity ... formats to WAV audio format. 6.Built in amplifier, can drive 0.5W/8ohm speaker directly. Without external components, can meet ... . ApplicationsSuitable for advertising announcers, banks , hospitals , gradens , and etc. PIR Sensor Sound Module