"Simply slide the Polybonder across bags to cut and seal airtight." Finally an inexpensive and easy way to perfectly seal any bag airtight to keep your food fresh for longer! You simply slide the Polybonder along any bag to cut it to size and leave it sealed airtight. Great for sealing your bread, sandwiches, crisp etc..... Also very handy for packaging items professionally as it will cut and seal mail bags to size - no cellotape required! This amazing gadget should be in every kitchen or packing room! It has patented micro-thermal technology to heat and bond bags efficiently. An impressive thing to try is to fill up a goldfish like bag with water, then slide down the middle with the Polybonder and watch it spilt into 2 bags of water - completely leak proof! This is a good trick for making your own Ice-poles. You have to see it to believe just how good and handy these babies are! Requires 4 Alkaline AA Batteries (Not Included)