When pressure cooking and time is finished the valve will automatically go from sealed to venting. I turned on Bluetooth on my Samsung SM-G930A and linked it with the device. These are a great alternative to slippers around the house. They are WAY too bright at night. There is always a little note that explains how to care for the items and what to do if you have any issues. I just place my phone and watch on the charger when I go to bed and everything is charged up by morning. I would have given it 5 stars if not for minor issues:- instructions are terribly vague and not properly translated- music shuts off for a few seconds when you switch back from reverse, not when you switch into reverse though. Until then I think a $60 slim hub USB-C adapter works much better for most people. During this time I also ordered a pair of Senhiser HD 599 headphones. Heck, these cost more than 97% of the SHOES Ive ever owned as well!