Addon to Bluelight Filter enabling to go beyond 80% of opacity.Main app is required and can be downloaded for free at http://goo.gl/V2AsncTake care not to set the opacity too dark in order to operate properly your devices. If you cannot operate your device anymore, please follow the following steps: 1. Turn off the screen. 2. Turn on the screen. 3. Wait for 10 seconds. 4. The filter opacity will be back at 80% if it was at more than 80%.We shall not be responsible for any loss, damages and troubles.