Given a text passage as input comprising of dialogue of negotiations between a seller and a buyer about the sale of an item, your task is to classify the item being sold into exactly one of these categories: 'housing', 'furniture', 'bike', 'phone', 'car', 'electronics'. The output should be the name of the category from the stated options and there should be exactly one category for the given text passage.

Buyer: I'm interested in your powerbank--I'd be willing to pay $9 for it
Seller: You know this power bank is brand-new right? So it's worth $20 and I already lowered the price to $12 so I could sell them quickly.
Buyer: Of course--there are comparable products on the market, inlcuding from amazon, for a similar price
Seller: I made sure to price them below the prices on Amazon. I will go down to $11 final offer.
Buyer: I'm willing to consider $11, are there other perks to this device I should be aware of? I know that it has several protections built in--but I want to make sure
Seller: Yes the battery actually last a long time and it has five security protection.
Seller:
Buyer:
electronics