Model No.:RTB5506
Main Features(changeable):

1.FSK/DTMF compatible     
2.50 incoming call memories    
3.Real LCD week and date display    
4.5 levels of LCD brightness adjustable    
5.Do Not Disturb function    
6.16 kinds of normal ring adjustable    
7.HF/Ring volume adjustable    
8.Anti-thief function     
9.P/T dialing mode selectable    
10.Flash:1000ms/600ms/300ms/180ms/120ms/100ms/95ms/90ms    
11.3 groups of alarm function    
12.Redial function    
13.Area code and long-distance area code