Sorry, no online dictionaries contain the exact phrase device that amplifies efficiency.

Reverse dictionary results:
1. hearing aid
2. deaf-aid
3. repeater
4. transmitter
5. laser
6. maser
7. phonendoscope
8. economizer
9. amplifier
10. booster
11. loudspeaker
12. arm
13. ear trumpet
14. acoustic device
15. accent
16. amenity
17. tuner
18. adjunct
19. atm
20. calorimeter
21. control
22. controlled
23. controlling
24. diffuser
25. electric
26. loop
27. mike
28. turbocharger
29. megaphone
30. code
31. orbit
32. palsy
33. paralysis
34. stroke
35. suprasegmental
36. telephoto lens
37. radio
38. electron multiplier
39. sonobuoy
40. bullhorn

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You can look up the words in the phrase individually using these links:   device ?   that ?   amplifies ?   efficiency ?
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