Repel different types of birds with the Weitech bird repeller! This repeller works with audible sounds and a flash that goes off as soon as it detects movement. This creates a frightening effect that will scare away the birds. The volume can be adjusted to suit both large and small surfaces. Please note that the sounds are clearly audible and you should consider your environment when using this repeller. The repeller works on 4 AA batteries (not included) or the supplied adapter.