As far as i know, there is an electric motor connected between the gear & engine. Its a slim but power electric motor & charger. Batteries are stored under the rear seats. Electric motor provides assistance to the gasoline engine at almost all speed but at lower speeds electric assistance is high with quick acceleration assistance reduces and gasoline is consumed. At high but constant speed, assistance increases, battery charges during deceleration.
I think its a great technology, but a country like Pakistan is not ready for such a tech. People here are still going nuts with EFIs. I am personally very uncomfortable with Li-ion batteries. Its hard getting a 12-cel laptop battery in Pakistan, i have to order it online everytime.