4.0x3.0mm Oval Nickel-plated Metal Domes.

1. Shape Design: The oval design provides stable deformation and rebound.

2. Material Selection: Commonly uses high-elasticity metals such as stainless steel or phosphor bronze to ensure durability and fatigue resistance.

3. Clear Tactile Feedback: Provides a noticeable tactile response when pressed, suitable for precise input devices.

4. Low Resistance: Generally has low resistance to ensure good conductivity.

5. High Stability: Maintains consistent performance and pressing force over long-term use.

6. Durability: Can withstand millions of presses, offering a long lifespan.

7. Different Plating Layers:

   - Nickel Plating: Improves corrosion and wear resistance, commonly used for high-durability requirements.

   - Gold Plating: Offers very low resistance, excellent conductivity, and oxidation resistance, suitable for high-precision and high-conductivity requirements.

   - Silver Plating: Provides low resistance, good conductivity, and oxidation resistance, suitable for mid-to-high-end electronic devices.

8. Main Applications: Widely used in mobile phones, car audio systems (PICK UP, CD, DVD), automotive series, micro motors, computers, digital products, cameras, video cameras, printers, scanners, buzzers, speakers, MP3 players, MP4 players, medical devices, and various other industries.

9. Metal Domes: Made from ultra-thin stainless steel material, they serve as a type of key switch with good conductivity and tactile feedback. Utilizing the dome's rebound, they provide tactile feedback to the operator, featuring strong conductivity, excellent hand feel, and long lifespan. The primary working principle: when pressed, the center point of the metal dome contacts the PCB board to form a circuit, allowing current to pass through.

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