With this application you can record audio and video without even taking your phone, simply by repeatedly pressing the button on your device for two or three seconds (pressing twice a second) and it automatically recording you will know by a slight vibration.
+ Audio recording in the background.
+ Record a video on the front or rear backround camera.
+ Start recording without having the application open. (All you have to do is open the app once since the last time you turned on the phone)
+ starts or stops recording by pressing the power button on the device repeatedly.
+ start or stop recording by pressing the hidden widget six times (transparent)
+ Start recording when the countdown reaches zero.
For More Info Google Play
varies with device
Download Hidden recorder 4.1 Unlocked APK For Android