This mimics the sound generator engine noise. Frequency is controlled in veteza engine running, so it varies with engine speed from the model. Volume can be adjusted through potentiometer.

It is equipped with switch ON/ OFF.

Specifications:
Input voltage: 7.4V (2 cell LiPo)
Speaker: 4 Ohm / 10 W / D50 mm
Overall dimensions: 62 x 40 x 32 mm
Total weight: 110 grams