The evidence bag impulse heat sealer utilizes electrical technology for safety and efficiency. The unit is activated only when the sealing arm is depressed, creating a short surge of electricity that seals film instantly. The sealing arm is hot only when activated so you won't waste money by forgetting to unplug it. No warm up time is needed for an impulse sealer. The system is ready when you are. The variable timer controls the heating intervals, sealing a variety of films from polyethylene to foils instantaneously. Ideal for the Fitzpack Heat Sealable Barrier Pouches and to permanently seal the Zipr-Top bags.