The 5402 supports the following features:

• Fully Global ready (Icons used to indicate fixed button functionality).
• 2-line x 24-character display with 2 programmable call appearance/feature keys....
  

The 5410 supports the following features:

• High-end feature set with local call log and speed dial directory.
• Advanced user interface...
  

The 5420 supports all of the features of the 4406 with the following differences:

• High-end feature set with productivity local call log and speed dial directory.
• Advanced user interface...