Klack's marketing headline "Satisfying sound with every keystroke" immediately stopped the scroll and works well for these reasons:

• Focuses on the sensory experience ("satisfying sound") rather than just functionality

• This evokes the tactile, auditory pleasure that keyboard enthusiasts specifically seek

• "Every keystroke" emphasizes the consistent aha moment of using the product

• Appeals to the emotional aspect of typing rather than just technical specifications

• Highlights a unique selling point that differentiates mechanical keyboards from standard ones (click klack!)

• Simple language creates an immediate understanding of the core value proposition

• Underlining "sound" reinforces the true purpose of the app