Danny En

When nothing else helps, security technology Gertzen does! Mr. Gertzen managed to open the closed (self-locking) door without damage and did so at a very fair price, without exploiting the emergency. Unfortunately, this could not be said of one of his competitors in Ostbevern. I would turn to Mr. Gertzen again at any time if my door were to close again.

Tim Kampmeier

An excellent and very friendly consultation on-site, nothing was pushed, and various options were offered neutrally. The communication with Mr. Gertzen is also exemplary. Installation on-site was quick, thorough, and flawless! Thank you very much!

Guido Keysers

Very friendly and helpful. Came by immediately after the call and solved the problem with the front door competently and quickly. My unrestricted recommendation.

Lena Kavas

Quick, reliable, and very good work!, The price-performance ratio is also right, and the nice Mr. Gertzen was quickly on-site and opened my door in no time. Simply top 😊

SHG Mientus

With a lot of experience and an eye for detail, Mr. Gertzen impressed us with first-class advice. Directly on-site with a renowned product range of security technology to touch and try out in the well-stocked mobile exhibition. Quick and first-class execution of the security measures in our home. We thank you.