Simple Contact with Water (3 atm): Resistance to pressure equivalent to approximately 30 meters depth. Protects against light splashes and moisture, not against submersion in water.
Hand Washing (5 atm): Water resistance to pressure roughly equivalent to 50 meters depth. Suitable for everyday water contact, such as hand washing or rain, but not for prolonged immersion.
Automatic: Watches with automatic mechanisms do not require manual winding, as they wind with the movement of the hand by rotating a rotor that coils the spring.