What is available for older bikes to prevent theft besides 44 mag.? I want an audible alarm with pager option

Scorpio from Aritronix. A fellow poster got one on my recommendation and is stoked with his so far. http://www.scorpioalarms.com/products
I've had mine (ThunderPager) for over seven years with no complaints and great results. Don't have to keep my eye out the window anymore at whistlestops! :)

I did hang onto my Walther however as a backup...