The on/off button doesn't work. I bought two pieces, one is permanently off. I press it to turn it on and it turns off, I have to hold it with my hand for it to work and as soon as I let go, it turns off. The other one is permanently on. I had a variety, I can't say. Therefore, if there was a zero star rating, I would give it a round 0. However, I repeat, for this specific model with this button, it is a defective model compared to the old button.