LLR Partners has invested in 3SI Security Systems Inc., a manufacturer of tracking and electronics protection systems, for an undisclosed amount. The PE firm’s investment will support the target’s growth through technology infrastructure development, strategic acquisitions, sales and marketing.

3SI designs asset protection and GPS tracking technology materials used to recover stolen cash and high-value goods. The Malvern, Pennsylvania-based target manufactures products that help combat crime through GPS tracking, dye and ink staining, and gas emitting materials. 3SI serves a variety of markets, including the financial, retail, cash in transit, police agency and law enforcement industries. The target operates a GPS tracking support facility and has trained more than 6,800 law enforcement agencies to use its technology.

LLR is a middle-market private equity firm based in Philadelphia, Pennsylvania. The firm primarily targets the software and technology-enabled services industries. The firm acquired cybersecurity company BluVector from Northrop Grumman Corp (NYSE: GOC) in January. LLR also backs companies in the business services, consumer goods, education, financial services, and health care services sectors.

In 2016, the firm made an investment in remote video monitoring service provider Eyewitness Surveillance. Before that, the firm has invested in: disaster recovery business Agility Recovery; payment service and data management company Phreesia Payment Services; and technology-services company Aasonn LLC.