It is pretty simple to anchor this device on the all, the roof, but you should consider some requirements as follows. The good news is this model is completely customizable with different levels of loudness, 8 sound recordings and adjustable timer (daytime, night-time, whole day and random).

I am also pleased to include Aspectek Ultrasonic Aminal Repeller in my recommended electronic bird repellent due to its portable design, affordable price yet powerful.And because thefrequency of the ultrasonic deterrent is adjustable, it can also be made to repel rats, mice, squirrels, foxes, cats as well asbirdsetc, Please note the Sentinel can only be set to repel one animal type at a time. In other words, it can't repelcats andbirds at the same time because those animals have different hearing ranges.

Unlike owl statues and shiny tapes, ultrasonic repellers last long if maintained well. For solar-powered units, you barely have to do anything once it’s installed. Just ensure that the repeller is waterproof and made for outdoor use. What to look for when buying one

DEFRA’s view:

PestFix offers a comprehensive range of distress call systems that will cover any requirement, both outdoor and indoor that can be used as a stand-alone deterrent or as part of an overall programme of bird control. Bio-acoustic sounds are considered to be effective for general-purpose bird-scaring due to the fact that they act on the target species’ instinct to avoid danger. In terms of kind of sounds, some devices are recorded with natural bird predator calls, distress calls, or the groaning noise of animals. These sounds are the best tool to cast birds away, but people may feel frightened and haunted. Other devices produce chirping or clanking sound only.