This Hair Accessory Can Act Like a Panic ButtonA high-tech hair clip promises personal security.

Entrepreneurs:Rachel Emanuele and husband Arthur founded First Sign Technologies, a Scottsdale, Ariz.-based line of safety products. The company is launching with a hair clip that contains a mechanism capable of detecting sudden movements that may indicate that an assault or attack is taking place.

"Aha" moment:One dark night, Emanuele had an uneasy feeling when she arrived home. "The lights were out, and it was pitch-black outside," she says. "I realized then that our home security system protected only our house, not me coming home alone and facing a potential intruder."