It uses very little power ... my N9 can stay on 10 mA-level (even below) on IDLE state (when internet is active, 3G or WLAN) and even below 8 mA-level (without active internet) - based on Battery Usage apps (it is not perfect apps, but it is very good to control your power consumption - it might give you wrong numbers on idle state in some certain situations) ... anyway, I can confirm that lpsmagic apps does NOT cause a higher power consumption ...