Using this Bobrick vending machine is super easy. Just press the button, and with less than 5 Lb of force, your tampon or napkin will be dispensed into the accessible product tray. When it comes to loading products, you don't need to worry about any weights. Simply open the door using the key that's the same as other Bobrick accessories and fill it up with tampons or napkins. You can hold up to 30 tampons and 20 napkins inside. As for maintenance, keep the machine clean by wiping the satin - finish stainless - steel surfaces regularly. If you want to change from free - vend to a coin - based system, it's a simple conversion to 25¢, 50¢, or token operation. Remember to always use the correct key to open the door and don't apply excessive force on the push - button.