Guys most of you needed some times in your life to records a voice secretly without open up your phone. If you will record a voice via sound recorder app then you have to open your phone in front of others. If you want to catch a blackmailer or a person trying to threaten you or a person asking you for a bribe, you can do all this easily via a simple app.
There is a Secret Voice Recorder app is available in Google Play Store, from there you can download it in a short memory storage. After download this app, install it in your phone. Now for recording the voice secretly, you just press the Power Button thrice withing 2 seconds (this time is default, but you can change it as per you convenience) to start automatic sound recording.