In common with other sounders in the VTG range, the VTG-AT is fitted with a dual function DIL switch, allowing the selection of tone and the setting of the volume. However, in addition the AT is fitted with an integrated anti-tamper switch which when utilised means that unauthorised removal of the sounder will result in the automatic reporting of the event to the control panel.

Standard on all VTG products is a universal locking system. Using an industry standard grub screw, VTG products may be lock in place, making VTG fully compliant with the latest requirements of British and European standards.

The unit is supplied with a deep mounting base, which in addition to offering ingress protection of IP65, allows quick fit installation by the use of a bayonet fixing arrangement. The deep mounting base features a cover plate that is discarded for surface wiring and kept in place when wiring directly through into the rear of the product.