features and benefits: 2.4ghz/1.9ghz, is based on frequency hopping technology the 2-in-1 functionality is like having a second (internet) phone line for free. multi-handsets (6 handsets max) 1.4 ¡° lcm display fsk (type i / ii) / dtmf caller id 100 groups phone book number (32 digits ,10 character.) 100 groups caller id number (24 digits, 10 character and time.) 50 groups outgoing call number (32 digits ,talk time and date.) 20 groups midi and melody 4 level ringer volume selection in handset(off/low/mid/high) tone / pulse dialing mode selection in handset recall mode selection(short, long, extra long) 6 level talk volume control alarm clock can be set area code(6digits) 4 level battery indication 4 level lcd contrast auto answer danny@vnetphone.com skype id: cnwxdkj