Sushi Ganeshan, the director of Tamil film Kanthaswamy, has come up with an innovative way to promote his film. The trailer of the film has been released through unique electronic invitation cards, the first of their kind in the country. The electronic cards carry an eight-minute photoflash of the film's promos. Ganeshan has imported nearly 2000 such invitation cards from China's Shenshen city, which boast of a small LCD screen and mini rechargeable speakers.