Right now, I have some choices:
1.Franklin Merriam-Webster Speaking-Spanish English and Advanced Learners English Dictionary . Model: SCD-2100
Shortage:no phoenetic symbols.
2.Franklin Advanced Merriam-Webster Dictionary & Thesaurus (with Spell Correction).
Model: MWD-1500
Shortage: no speaking.
3. Chinese electronic dictionaries
shortate: no Merrian-Webster dictionary.
I haven't made my final decision yet.
You can also google similar products online.If you found the perfect one, please let me know.