For further assistance regarding your product, we highly recommend visiting our Sony Global Web site for information on contacting the Sony Support Center in your region at http://www.sony.net/SonyInfo/Support/.
If my post answers your question, please mark it as "Accept as Solution"
Thanks for the answer. However, I can not compare specs exaclty. For example file extension WAV, carrying case, noise cut, voice email function. These are just examples. What I look for is a comperative chart to decide which one is better for my aim to use.