This is a 30 Minute 1 Second pure black screen video – perfect for saving battery on AMOLED displays, sleeping in darkness, or using as a black background. Uses: Sleep in total darkness Reduce screen brightness Save battery on AMOLED screens Use as background for meditation or relaxation Video Length: 30 Minutes and 1 Second Resolution: Full HD (1080p) Note: This video contains no sound and no movement. Ideal for night-time use. Don’t forget to Like, Comment, and Subscribe for more useful videos!