Send after payment the next day, warned that there is no specified color, Offered a choice. I sent the fight. Thanks to the store. Delivery within a week. Everything works, first turn on the outlet, then snap and for sealing press the entire length, to vacuum press on the burning bulb. After the vacuum, pull the rubber button to the side that would come down the air. That's the whole process. Very easy and convenient. 15 packs and knives for packages included. I recommend