Model: RTB6665
Features(Reference):

1. FSK/DTMF Compatible
2. Two-way speaker
3. Real LCD week and date display
4.50 incoming and 14 outgoing call memories
5. 16 kinds of normal ring selectable
6.3 groups of alarm function
7. Flash time adjustable
8. Do Not Disturb function
9. P/T dialing mode adjustable
10.Anti-thief function
11.Area code and PABX code setting
12.5 levels of LCD brightness adjustable
13.One group Auto IP and one group of manual IP setting
14.Redial, pause and flash function
15.Pre-dial, edit and back dialing function
16.Mute function
17.4 groups of one-touch call memories
18.10 groups of two-touch call memories
19.4 levels of handsfree volume adjustable
20.4 levels of handset volume adjustable
21.3 levels of ringer volume adjustable
22.Ringer LED indicator 
23.Mute LED indicator
24.Key lock function 
25.Wall mountable