includes diesel-powered air heaters, liquid engine pre-heaters, and associated accessories and control units. Hotline also organizes technical training, product installation seminars, and warranty support programs for corporate fleets, independent mechanics, and service workshops. In addition to heating products and parts retail, the company brokers service relationships and coordinates local compliance and aftersales support. Hotline further conducts complementary activities such as rental and leasing of cars and light motor vehicles and targeted information hotline services linked to its core offering.