Use the floating button to quickly turn off the screen and unlock it by tapping on it.
App Feature List:
• Floating button to quickly lock the screen
• Battery saver on AMOLED & OLED screens
• Play videos, listen to podcasts, record videos, play streams with screen off
• Always-on display option
• Pure black option
Warning: This is not a lock-screen app, it is just a black screen overlay on top of the app you are using. This helps in saving battery on AMOLED devices.