Here are the rephrased versions of the provided statements:

For Versatile Commercial Use:

• Sturdy mechanical design for enhanced durability
• Resistant to weather and impact
• Corrosion-proof
• Equipped with EMC protection
• Ideal for external mounting and off-road use

Sound Features:

• Dual horns: 1 high tone (335 Hz), 1 low tone (420 Hz)

High Reliability and Long-lasting Performance:

• Strong construction ensures high resistance to impacts and corrosion.
• Bosch Teflon Filter technology effectively prevents dirt and moisture buildup.
• Approved according to ECE standards.

Multi-purpose Design:

• Perfect for external mounting, off-road, and commercial vehicle applications.

EMC Protection:

• Shielded from electrical interference with other vehicle electronics (Applicable for specific part numbers only).