Hey,

To manually turn the siren on or off:

1. Launch the Arlo app or log in to your Arlo account at my.arlo.com. 

2. Tap or click the shield icon at the upper right of the Devices page.

3. Tap or click Activate Siren. 

4. Swipe the siren icon to the right.

For further information you can visit our website: 

Netgear Arlo Login | Arlo Camera Setup