Personally, I got it for cat storage. No result either in the intensity based on the instructions or in higher. But turning it towards birds I noticed that they left immediately.

The pigeons are still laughing, unfortunately it doesn't do anything. I tried all the programs, changed positions, got very close but nothing, let me tell you, mine are commando.

For as long as it worked, it did a decent job. From a certain point onwards, I started doubting its effectiveness. However, I couldn't confirm it because the battery no longer held a charge.
It barely lasted a few hours. I think its solar panel can perform adequately if it's directly exposed to sunlight, but again, I can't swear by it. I no longer use it...