Features: 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-hand s (6 hand s max) 1.5 ?CSTN LCD,65K colors 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 hand (off/low/mid/high) Tone / Pulse dialing mode selection in hand Recall mode selection(short, long, extra long) 6 level talk volume control Alarm clock can be Area code(6digits) 4 level battery indication 4 level LCD contrast Auto Answer Room monitor Baby Call function Walkie Talkie function ( Hand -to-Hand Intercom function ) Multi-Language Ability to participate in Skype multi-party conference calls Secure and encrypted communication Caller ID (CLIP) and Call Waiting Call Transfer between Hand s Key pad lock Plug & Dial - Easy to install - easy to use Future-proof: The software of the hand and base station can be d via the USB interface