If you are an Amazon buyer, you need to use a device with an Internet connection (such as a computer, tablet or smartphone), and you need to create an Amazon account to browse and purchase Amazon's products.

If you are an Amazon seller, you need the following equipment:

1. Computer: You need to use a computer to manage your Amazon seller account, update your inventory, process orders and track sales data.

2. Camera: You need to use a camera to take photos and videos of your products to upload to Amazon to display your products.

3. Printer: If you use Amazon's delivery service to send your products, you need to use a printer to print shipping labels and invoices.

4. Inventory tracking device: You need to use an inventory tracking device, such as a barcode scanner, to manage your inventory and ensure that you always know which products you have and their inventory quantities.

5. Amazon Seller App: You can use the Amazon Seller App to manage your seller account and orders on your smartphone, which is a very convenient tool that allows you to access your seller account anytime, anywhere.

These are the must-have devices as an Amazon seller that will help you better manage your Amazon business.