1. 'The mass acceptability is a must for a product to be sold in large scale. With a particular reference to India, what are the acceptability requirements, in general, for any product to make it well acceptable in masses? India has 300 million mobile phone subscribers and the mobile network is still expanding. In India, mobile service is available and being used at places that do not even have the landlines yet and by the lowest income category people like rickshaw pullers, small vegetable vendors, etc. The mobile phone acts as the primary source of communication for business, entertainment and emergency services across India, practi- cally in each walk of life. Cell India, a start-up company, approached the technology design company with the basic technology to design a mechanical charger to meet the requirements and habits of Indian users.