Siewert & Kau
Siewert & Kau
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All information from those responsible for the content

Siewert & Kau Computertechnik GmbH
Walter-Gropius-Str. 12a
D- 50126 Bergheim
Phone: +49 2271 – 763 0
Fax: +49 2271 – 763 280


Björn Siewert, Oliver Kau, Holger Kau, Claus Holzleitner

Commercial register

Amtsgericht Köln (Cologne Magistrate’s Court) HRB No. 40720

VAT ID-No. DE812098823
WEEE-Reg.-No.: DE46285170

© Contents

Siewert & Kau Computertechnik GmbH

Downloading or printing individual pages and/or part of these websites for private use is permitted. Any use for commercial purposes is explicitly forbidden. Copyright, trademarks and other copyright indicators must not be deleted or removed.

Order Countdown

** Provided the goods are available, delivery type has been chosen and order has been placed in time. We accept orders placed online or by telephone before 6 p.m. We do not assume any liability in case delivery dates are not met due to delays caused by the carrier.


All information provided on this website has been carefully checked and is being updated on a regular basis. However, no liability or guarantee can be assumed for the information provided to be complete, correct and up to date at all times. This applies in particular to all links to other websites referred to either directly or indirectly and the product images and specifications displayed. All information may be modified, removed or added to without prior notice.

Reference pursuant to Battery Act – BattG

With respect to the sale of devices containing batteries, rechargeable batteries or power packs, we are – pursuant to the Battery Directive – obligated to point out as follows:

  1. If improperly stored or disposed of, the chemical components of batteries can be damaging to health and the environment. Such health and environmental consequences can only be avoided by separating the batteries from the household refuse for collection and recycling. For this reason batteries must not be disposed of with the normal household refuse.
  2. As an end user you are legally obliged to return used batteries (whether rechargeable or not) or to dispose of them properly. You can hand in your used batteries free of charge at the public collection points in your community or at various sales outlets. In the case of sales outlets, the quantity and types of batteries submitted for disposal are limited for end users to usual quantities and to such batteries as the sales outlet offers – or has offered – as new batteries in its product range.
  3. This sign means that – due to the pollutants they contain- you must not dispose of batteries in the household refuse. Below above sign you may also find the following symbols, having the following meanings:

Pb: Battery contains lead
Cd: Battery contains cadmium
Hg: Battery contains mercury

These references will also be given in the documents accompanying the consignment or in the operating instructions provided by the manufacturer.

We intend to use electronic postal addresses (e-mail-address) obtained during purchase order processes or on rendering services pursuant to the provisions set forth in § 7 subparagraph 3 German Unfair Competition Act (UWG, please see excerpt of the text below) for direct advertising purposes with respect to our own similar goods or services. You may object to the use at any time in case you do not consent to this. Please find contact details for such objection in our Legal Notice.

Purchasing and security

We attach particular importance to the protection of our customer data. This is why we exclusively use tested encryption technologies in communicating. The SSL (Secure Sockets Layer) network protocol guarantees safe data traffic between siewert-kau.de and our customers. SSL was specifically developed for safe data transfer on the internet. The URL will change in case SSL encryption is being used during data traffic. In this case of encrypted data transfer it will read “https” instead of “http”.

Extract from the German Unfair Competition Act (UWG)

Section 7 – Unconscionable pestering

  1. A commercial practice unconscionably pestering a market participant shall be illegal. This shall apply to advertising particularly in cases where it is apparent that the solicited market participant does not want this advertising.
  2. Unconscionable pestering shall always be assumed in the case of
    1. advertising using a medium of commercial communication not listed under numbers 2 and 3 which is suited to distance marketing and through which a consumer is persistently solicited although it appears that he does not want this;
    2. advertising by means of a telephone call, made to a consumer without his prior express consent, or made to another market participant without at least the latter’s presumed consent,
    3. advertising using an automated calling machine, a fax machine or electronic mail without the addressee’s prior express consent, or
    4. advertising using a communication where the identity of the sender, on whose behalf the communication is transmitted, is concealed or kept secret, or where there is no valid address to which the recipient can send an instruction to terminate transmission of communications of this kind, without costs arising by virtue thereof, other than transmission costs pursuant to the basic rates.
  3. Notwithstanding subsection (2), number 3, unconscionable pestering shall not be assumed to exist in the case of advertising using electronic mail if
    1. the entrepreneur has obtained from the customer the latter’s electronic mail address in connection with the sale of goods or services,
    2. the entrepreneur uses the address for direct advertising of his own similar goods or services,
    3. the customer has not objected to this use; and
    4. the customer has been clearly and unequivocally advised, when the address is recorded and each time it is used, that he can object to such use at any time, without costs arising by virtue thereof, other than transmission costs pursuant to the basic rates.