Not only this device is great but in fact it is mentioned: my Samsung S2 is a sub Android 4.1.2 when it is supposed to work from 4.2.2 and it also controls the zoom of the phone. Only small problem, it can only increase the zoom then remains locked when he arrived at max but as this is a bonus, it does not matter. FYI, the battery is expected to last 6 months to 10 uses per day.