A little alarm like that probably has only a tiny piezo speaker that may sound loud and piercing up close but won't carry far. And it's probably easy to defeat with a generic universal remote that can be programmed to handle hundreds of devices.

And regarding nightclub security guards and bouncers, I wouldn't trust 'em farther than I could throw them -- which is not at all. Many of 'em make extra cash as police informants, tipsters to thieves, and tipping off paparazzi in celebrity-heavy cities.

One cold winter night several years ago my motorcycle konked out. Never could figure out why but that bike didn't like cold or wet weather. I locked it to the nearest fixed structure I could find and went inside a shady looking joint to use the phone (this was pre-cellphone era). While waiting for my wife to pick me up I struck up a conversation with the gal at the front desk and the security guy. For some reason they must have decided I was an okay guy. She called her boyfriend and told him not to steal my motorcycle, which I was going to leave there overnight. It was just a routine thing, a vehicle theft ring associated with the employees at this joint, preying on their own customers.

Nowadays when I'm bicycling, especially with casual social group rides, we only visit bars that are bicycle friendly and let us bring the bikes inside or park on the patio. I usually don't even lock up my bike because it's only a few feet away.