In the last 19 months I have ordered a total of 11 of these three-stage Gama buttons. (Two orders) So far ten have failed in the same place. I use them on my wheelchair to adjust my seat back. All began to either stick or close. All have been dried. They seem to have a very short lifespan. Now I will definitely buy another brand. I'm tired of lying on my back because of the shorting switches. Another brand of the same $ but not from Revain.