WTV-S1 PIR Sensor Sound Module Built-in amplifier, can drive 0.5W/8ohm speaker directly. ... WAV audio format. 6.Built in amplifier, can drive 0.5W/8ohm speaker directly. Without external components ... the general audio output power 7.Audio playback with good quality 8.Can update the voice many ... volume, can be used in various environments12.Matched with the simple PC software which is powerful, easy ...