Note : NeuroSky Products for Indian market are designed and
configured to work in countries that have 50 Hz AC power-line
frequency. Orders placed in India will be shipped 50 Hz units so that
they will operate correctly in India.US version of NeuroSky products
may not work reliably in India as they are designed and configured for
60 Hz AC power-line frequency which is the US standard. Online store in US ships 60 Hz version of products by default.