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Bought this for use in my Sony Ericsson k800i. It was quite expensive for its size and is probably a lot cheaper now than when i first bought it. I have never had a problem with the device, it is incredibly small (about 1cm x 1.3 cm) and so you need to have an adaptor in order to plug it into laptops etc. When you buy it you may get an adaptor with it but you may want to check as it could be quite annoying if you had to buy one separately. I have only ever used this in my phone but i have used my phone for recording lectures and it always stores the data as desired. Data can be transferred easily and i've never lost any information. Overall it does exactly what you would expect and want in a memory stick while remaining a quarter of the normal size.