Bought from snapdeal no fuss device just put a duracell battery and it should work without any problem for atleast 6 months once you connect the wireless usb plug drivers are installed automatically and you are ready to use the device in just few mins . If you use a good quality alkaline battery there will be no lag whatsoever in using it . Top wheel on the mouse is really handy and very easy to scroll on the web pages . Like any other Dell product built quality is solid I have dropped it hundreds of times but never faced any issues till now. There is a LED on the top which blinks when you turn it on, it flashes red indicating battery on the device is going to die . There is a separate compartment for keeping the USB plug inside in case if you are travelling .