Cat Repellent, Garden Cat Repellent Cat Deterrents

Was a bit skeptical at first, but I’ve had these a month now and they seem to be doing the job of keeping cats out of my raised veg beds/lawn without deterring birds or the local hedgehog. I’m using setting No. 2, with the sensitivity at max. to get a detection range of about 6-8m at full charge.
They charge in about 1-2 hours with the mains charger. It being Aug/Sept and UK, (with the solar panel in the sun 6+ hours/day) the Solar panel is keeping the battery topped up well for about a week before I have to charge again using the cable. I suspect I might be charging it every day come Dec/Jan. This is despite the scarers constantly activating due to nearby plant motion/passing bees etc.
The “Sensitivity” dial really means “Detection Range”, but the sensor will trigger at every plant motion and passing bee within that range. I can hear them when i’m in the garden but most of my friends/family can’t, so I guess I just have sensitive hearing. However, the sensor also has a red light and also clicks on and off (my family can hear that) so if you can’t hear the high pitch at least you can see if it is still working/needs charging.