The ZeFit4/4HR is in accordance with IP67.
IP67 indicates that the product is resistant to dust, rain, splashing water jet and immersion in water up to a meter immersed in tap water at room temperature, for a maximum of 30 minutes. Immersion in water should be casual or accidental.
Do not shower or swim wearing this product. The change in water temperature, soap / shower gel and water pressure can damage the device.