Recommended: iPhone 6s and later and iPad Air 2 and later. If our Kids4Sign videos are not in your local sign language, don't worry! You can record your own sign videos in-app in your preferred sign language. Fantastic right?! Taking into consideration our target audience, Kids4Sign apps have no sound. But, in the Edit screen where you record your own videos, you can choose whether to mute or unmute your video sound.