evenflo dual electric pump

Do any of you mommies use this product? I just bought it, since I'm EBF. My week old son likes to eat a lot already lol. I only want breastmilk for him for as long as I can. I'm only getting maybe 4oz and it's making me feel discouraged. Will this pump help, and any tips on producing more milk? I feed and pump on demand and I'm hoping this electric pump will help since I just got it, and was using a handle pump.