Green Screen developed for shooting video/photo using camcorder or photo camera with device and green replaced with screen capture.
- Markers for tracking device motion
- Green chromakey
- Blue chromakey
- Brightness control
If glare is to much with max screen brightness, then try to reduce ambient light, if it not possible then use polarised filter.
Shake device to change settings.
Added marker transparency adjustment
Sleep Sounds: relaxing sounds 
dB meter - noise measure 
Ruler - tape measure length 