Hold for 5 seconds before use and slide the edge of the bag to seal. Purpose: to keep food fresh and dry. Features: Quick and easy to operate, using the latest technology, this removable food warmer works like a house and does not need to be reheated. When the lid is released, the efficient, low-loss heating film reaches sealing temperature. Place the bag to be sealed in the centre and slide it along the edge of the bag at a low and steady speed to create an airtight seal. Instructions: Insert 2 AA batteries (batteries not included) to unlock the safety/protection cover, press for 5-7 seconds to flatten the cover, seal the edges of the bag, insert the plastic seal, press firmly, move moderately from one end to the other and finally release the cover and move it back to its original specification. Material: High quality ABS material, resistant to high and low temperatures. Size: 9.7cm*3cm Colour: pink/white. Battery: 1.5V2AA battery, alkaline batteries only (not included)