Sonitrol Inc., Alexandria, Va., announced its parent company, Tyco International Ltd., has sold Sonitrol to a group of private investors: Spire Capital Partners, L.P., Carlyle Venture Partners, and Wachovia Capital Partners for $125.5 million.

Concurrent with the transaction, Kevin P. Dowd, was named chairman and CEO of Sonitrol, succeeding Chris Cobb, who will remain with Tyco’s ADT division. Dowd served most recently as President and CEO, at Checkpoint Systems,

Sonitrol has a network of 170 franchises serving 180 cities in the U.S., Canada, and the U.K.