The item for sale is the MK2Y heated plate for RepRap 3D printers, Delta.
It can be powered with a voltage of 12V or 24V. The heated plate allows an adhesion of the first layer of printing avoiding deformation of the object that is going to create (especially useful in case of ABS printing).
Warning! Before touching it, turn off the power and wait at least 10 minutes for it to cool down to avoid burns. Do not leave it unattended to avoid damage to children or inexperienced people.