General:

Everything we say in this is an excerpt from and a further explanation of our General Terms and Conditions of Sale. The text on this page is subordinate to the text of the terms and conditions that were most recently filed with the Chamber of Commerce. In the event of a contradiction, which we naturally try to avoid, the general terms and conditions of sale apply.

When do you have warranty?

If within the warranty period the malfunction of the product is due to the product itself.

When do you have no guarantee?

If within the warranty period the malfunction of the product is not due to the product itself, but has another cause. One then speaks of an external calamity and then the warranty claim expires.

What is Mischief?

The word onheil has somewhat fallen into disuse in Dutch. Disaster or disaster are good synonyms: it is about negative influence from the outside. Rolfstone.com continues to speak of 'outside calamity', the official name.

Kinds of mischief from the outside

Damage caused by external disasters is often caused unconsciously. A number of types can be distinguished:
A. Sand damage
B. Fall and impact damage
C. Moisture and water damage
The above-mentioned external disasters are not the only ones, but they are the most common.

A. Sand damage

Sand gets where you think it can't. Some examples:
A day at the beach
You are going to the beach for a day. You bring bread and pack it well in a plastic bag. The bag goes into the beach bag and yet it happens that there is sand between your bread while eating.

Playing football on the beach
You are on the beach and football is being played near you. The ball is coming your way. One of the players slides and scoops some sand into your bag with his foot.

You go home
Your product is in your bag. At the end of the beach day, put your beach towel in your bag. The next use may cause your camera to squeak. There was sand in your bath towel. Please note: sand damage can not only be caused on the beach, but anywhere there is sand, including forests, playgrounds, amusement parks, roadworks, etc.

B. Fall and impact damage

Most breaks or cracks are fall and impact damage. This does not always have to be visible.

If the product is bumped or dropped, there may be no visible damage to the exterior. Due to the refined technology used in the product, it is still possible that the product has suffered internal damage. Damage can be caused, among other things, by the following causes:

Your product is stuck
Your product is in your pocket and you sit down. The product becomes trapped and pressurized. There is a chance that the button(s) of the product will be pressed into the product.
A little cramming
Your briefcase is almost full, but you still put your product in it. You can close the suitcase with difficulty. There is a good chance that the button(s) will be pressed in the product.
Oops, your bag has fallen
You put down your bag and it falls over. You want to go to work and you notice that the product has been damaged.
That was close. You make it to the elevator, your bag bangs against the closing door.
You want to use your product at your workplace, there is no optical damage and yet the product does not work. There may be a print break.
You go to an amusement park and take your product on the most spectacular attraction. The safety bar holds you tight, which can cause the product to become trapped. Or the product can be thrown against something by the speed.

C. Moisture and water damage

You may not be familiar with the word moisture damage. Or you think we mean water damage. No, we really mean moisture damage. The differences:

Water
damage Water damage refers to damage caused by water after:
- Your product has fallen into the swimming pool or the toilet.
- You made a phone call with your product in the rain.

Moisture
damage Moisture damage is damage that is often caused without you realizing it (see the examples below), but it is also damage that, just like water damage, can be prevented with careful use. Sometimes you have to take measures - willfully and knowingly - to prevent your product from sustaining moisture damage.

What we mean by water damage will be clear, we will go into more detail about moisture damage.

Moisture damage after visible moisture
You usually do not even notice that something bad has happened:

A day at the beach
You go to the beach and decide to use the product. Unexpectedly splashes appear on the product, nothing seems to be wrong. Afterwards, however, this can cause major problems due to the salt water. Seawater causes enormous damage. Threads oxidize and are therefore no longer common. Or the copper tracks on the printed circuit boards are etched (away). Salt also increases the conductivity of water and can cause electrical damage in that way.

Spills
You accidentally spill coffee or lemonade on your product. You dry it off in a hurry and check whether everything still works. Fortunately. In many cases, complaints can still arise afterwards, due to oxidation.

Fog Fog
is also a form of moisture, which can cause damage to your product unnoticed. This is very visible when you are cycling in fog and it is freezing. When you arrive at your destination, you see that ice has formed on your clothes: frozen fog.

Invisible moisture damage
That is a moisture damage that frustrates. Moisture that you don't always see. You often do not know the cause of the damage: condensation.

A nice walk in winter
On a beautiful winter day you go for a nice walk with acquaintances in the freezing cold, you have your product in your jacket pocket. To warm up inside and out, drink coffee. Upon arrival, your product fogs up unnoticed and is therefore damaged

Condensation explained

Condensation is moisture that is created by condensation. Condensation is a major cause of moisture. Condensation occurs because warm air can hold more moisture than cold air. If this warm air hits a cold surface, e.g. a window, it cools down. The air can now contain less moisture, the moisture condenses and becomes liquid again on the cold surface.

Warm air therefore contains more water
. When cooking, for example, the temperature in the kitchen rises. So the difference in temperature between the cold surface and the air becomes greater and therefore there is more condensation.
When cooking, quite a bit of water vapor escapes, for example in the form of steam. In addition, if you cook with natural gas, carbon dioxide and water are formed when that natural gas is burned. That is why you sometimes experience that it feels stuffy in a kitchen where cooking is taking place.

No warranty for moisture
damage You have no warranty on moisture damage because the 'product' is not the cause of the damage, it is 'outside disaster'. You can assume that when you bought your equipment new, there was no moisture damage.

Repair moisture damage

Rolfstone does not repair moisture damage, but provides a suitable solution for both parties.

How can you prevent moisture damage?

You can prevent most moisture damage by taking timely measures. With one exception: you go to a tropical country and you take your product with you. Before the plane lands, put your product in a plastic bag or bag and seal it airtight. Take a transparent bag so that, for example, customs can see what is in that bag. Allow your product to acclimate slowly.
It helps if you pack a bag of 'silica gel' in the airtight bag with your product. Silica gel contains millions of tiny pores that can trap moisture. Essentially it is porous sand. Keep children and animals away from silica gel. It is irritating if eaten or if dust is inhaled.