Computer thieves little suspect that a desktop or portable can be rigged with an alarm that's just as earsplitting as any automobile security system. One model -- the SonicPRO, a one-inch-thick motion detector -- can be bonded to the outside of a computer. It has adjustments for sensitivity to motion and duration of sound. The device is backed by a three-year $5,000 insurance policy covering the theft from commercial premises of any desktop computer protected with a SonicPRO.

SonicPRO Model 128B, with insurance, is $79 from the Safety and Security Warehouse (800-404-9266).

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