She told me that that my calculator was not functioning and requested for a refund. Upon further enquiry into the nature of malfunction, only did she reveal that she chosed the wrong model, even though I have stated the model type explicitly in the product's title and description. I agree to refund despite her dishonesty and yet she took about a week before posting it back. To be fair she did pay for my postage fee. In the end I got nothing in return for my hassle. Very distasteful experience.

Easy and straightforward seller.