The yellow Pencil Jet II is an oral care device with a vibration function, and comes with two cartridges. - Model Name: Pencil Jet II - Accessories: Cartridges (2) - Brand: YOSHIDA - Color: Yellow - Function: Vibration function ※ Due to a malfunction of the main switch, we recommend a surge-protected power strip with a switch (sometimes). Please turn the main unit's power cord ON and connect it to the power strip, then use the power strip's switch to turn it ON and OFF. Thank you for viewing.