NORWALK — A California tech company is acquiring Bolt Technology in a $171 million deal.

Teledyne Technologies produces electronics for engineering systems, aerospace and defense, digital imaging (including software) and instruments. Teledyne is acquiring Bolt to expand its range of marine-instrumentation products.

Founded in 1965, Bolt produces marine seismic energy sources and parts for offshore energy exploration, as well as underwater cables and connectors, controllers and auxiliary equipment. It also designs and manufactures remote-operated underwater vehicles through its SeaBotix brand.