Sine wave (975Hz): Listen & Download Sine wave (975Hz) .mp3 Error! Change your browser, please! ⇓ Download Battery Hits ⚠ Bath, Cork in the sink ⚠ Item thrown on the bed ⚠ Ice crushing ⚠ Police whistle ⚠ Open wooden box ⚠ Umbrella opening ⚠ Tile falls ⚠ Kick on the door ⚠ Opening, closing a cigarette case ⚠ Movement, Elevator with hand doors ⚠ The noise of the room, ventilation inside ⚠ ★★★★★