This saved my Harley once
The above product installed in the cover pocket saved my motorcycle. I had my Road King parked in a secured apartment garage. They attempted to steal it in the middle of the day while most people were at work.
I parked my bike and had a Kryptonite chain locked around a pole. Had a rotor lock with siren locked on the rear, had a regular rotor lock on the front and the Guardian cover with the special pouch for the cover alarm installed. The alarm cover works like a grenade pin. If it is pulled out wile activated the sound is so loud and ear piercing you can stand next to it without ear protection.
When I parked in the garage for lunch I notice the alarm was going off. I went to inspect it and was surprised what I saw. Next to my bike was some metal filings where the removed the front rotor lock. When they went to pull the cover up the alarm activated and they left. What I saw was the metal filings and the cover partially removed. They will not know that you have this installed before the remove the cover. Maybe some thieves may look for this and disconnect it from the bike but it would also take more time to find where you connected it and remove it. It is simple to connect and remove yourself. The cover goes on like any other cover. The lock set up I used mught sounds excessive but I only did it like that when it was parked in that garage. When I'm out riding I always used a rotor lock and the fork lock along with the security system on the bike.
I will say the Harleys are more of a targeted bike, I had about $12K of extras and it drew a lot of attention. I do feel like less of a target while out on the BMW but still take precautions to prevent theft.
The cover with alarm is highly recommended by me