Good knight xpress system liquid vapouriser 2x dual power mode is now available in the market at affordable price.Its really a trustworthy company product which you can believe at blindly.as you switch on Xpress system gives relief from mosquitoes in just 9 minutes. normal mode is for regular protection against mosquitoes and xpress mode or active mode have much more power than normal mode for heavy mosquito attack .stay away from mosquito bite and stay healthy and free from many diseases such as dengue which is more commonly see in our locality .Its totally safe to use .really a good product.