You can track computers and other non-cellphone products in WholeCell - you just have to get a little creative with our product fields.
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For example, for a computer we recommend using WholeCell's “Variant” column to describe the processor, RAM, and GPU (if relevant). Here’s a WholeCell product for a MacBook Pro:

We have plans to add user-customizable product types in the future. Until then you can add these items to your catalog using the Variant column to store any product-specific information (or whatever other methodology you like).