Custom Link For Peter Price Difference For Smart Lock

1. Extra Cost for Upgrading the smart lock (google nest x Yale smart lock) This is only for buyers to pay an extra shipping fee/price difference. Kindly remind, this item is not a product. Don't order this item without purchasing other products in our store. This link for you to pay the price difference in the following situations:1. When you already have placed an order, but you want to change it to a larger size 2. When you already have placed an order, but you want to change from standard iron door to thermal break iron door.