: Brushless models often produce a high-pitched, almost squealing sound during operation. Brushed motors tend to have a lower-frequency hum or buzz, especially at lower speeds.
: Short bursts of power when tightening a screw. Cordless Screwdriver - Sound Effect
: Unlike a standard screwdriver, an impact driver adds a loud, repetitive hammering sound (a metallic thumping) when driving into tough materials. Common Onomatopoeia : Brushless models often produce a high-pitched, almost