A little surprised at first to see that once the lid closed, it is not completely fixed. This is the big difference between a classic casserole with Seb button screw. The Clipso Chrono is really very easy to use and the timer is a huge bonus. This saves gas seen after a few minutes, an alarm is triggered to warn that we must reduce the gas and another advantage that allows a cooking time respected as scheduled. The opening is also very simple. This is a great product that I recommend.