This is the PRO version which has following features over the free version:
- No Ads
- No search entry limits
- No favorites saving limits

Has also these features from the free version:

- blazing fast search
- save words and translations to the favorites list with a swipe
- word pronunciation in both English and German
- no internet connection needed
- search in English or German
- live search (search as you type in both English and German)