Produces a neatly sealed bag in a second. It's far quicker and less fiddly than putting on a plastic tie or a bag clip or tying a knot in the bag (I've tried all three over the years). I find using it quite fun too, must be the gadget-lover in me! It's approx. 22.5cm x 15cm high with tape loaded, and heavy/sturdy enough that it doesn't slip or move around when in use. Mine came with no instructions. As part of the loading, place tape sticky side up and lay it across the exposed mechanical part; put stuff in a plastic food bag, push as much air out as possible, twist bag, push bag neck through machine as close to the food as possible, machine seals the neck. The first bag sealing automatically threads the tape in the machine. I can't fault this sealer in any way and recommend it.
This review is for Bag Neck Sealer | Tape Dispenser with 6 free Rolls Amazon ref. ASIN B004FJL3EO.