In 1998 the company LESI take part in the annual specialized exhibition for protection, safety and security “SECURITY 1998”, Sofia, which marked the beginning of innovation in lock systems, and presents for the first time to the Bulgarian market - electromechanical lock BULKEY.


In 1999, the company presents its products in the locking systems of specialized exhibitions - International Spring Fair of Plovdiv, Plovdiv International Technical Fair, International Fair Modena - Italy.


In 2003, again participated in the exhibition for protection, safety and security "SECURITY 2003", Sofia as well as in the exhibition in Varna - "The three keys" and "Motor show 2003”.


In 2004, already a regular participant presents a new model range and avant-guarde system of announcement - GSM communicator at the annual exhibition of security - "SECURITY 2004", Sofia.


In 2005, at "SECURITY 2005", Sofia presents a new production of the range of models according to the laws changed of the Ordinance № 104 relating to the protection of vehicles by alarm systems.


In 2006, the company participates in the annual exhibition "SECURITY 2006".


In 2007 at "SECURITY 2007", Sofia, lock ing systems Bulkey returned to the Bulgarian market and the introduced its new developments.


In 2007 at the Plovdiv International Technical Fair, the company introduced in the new electronic locking systems and elektromehanichnite and hits great success and strong interest from users and partners from Bulgaria and abroad.


In 2008, the company LESI participated in the annual international exhibition for security and guarding "SECURITY 2008", which was held from 12 to 15 February. There presented the latest products BULKEY electronic locking systems, which provoked great interest from media and visitors. Part of the media have published special articles on BULKEY lock systems for their uniqueness, security and reliability. A large number of citizens visited the special exhibition, to meet with us and to get acquainted with electronic locking systems BULKEY. The assessment of colleagues and customers about our systems BULKEY was extremely high. During "SECURITY 2008" LESI company was awarded with honorary diploma and souvenir.

In 2008 LESI company took part in an exhibition STROYKO 2000 - the largest trade show for architectural, construction and furnishing held in Bulgaria. The exhibition was held in Sofia, during the period from March 26 to April 1 and passed with great interest. The company presented part of the new product range in the locking systems, security , protection and access control.