Here is what it is inside: <p>1) heavy duty metal body <p>2) fan to vitalize the smoke <p>Please note: Batteries are not included; this machine requires 4 double a batteries. <p>Warning: never leave the machine unattended while using and never use when the metal chamber or the stainless steel mesh filter is not in place as it will cause harm to the machine. <p>Here is how we recommend to use it: <p> Place the batteries on the opposite side of the nuzzle two downwards two upwards close it, put wood chips inside the metal chamber, lit with a match small lighter or a torch, make sure the food is sealed, place the nuzzle inside let the smoke go for 2-3 minutes, extinguish the fire turn off the machine let the smoke set and you are ready to go, enjoy your gourmet smoked food.