1. 2.4GHz/1.9GHz, based on frequency hopping technology 2. 2-in-1 functionality: Internet phone line for free 3. Multi-hand s (6 hand s max.) 4. 1.4 LCM display 5. FSK (type I / II) / DTMF caller ID 6. 100 groups of phone book number (32 digits, 10 characters) 7. 100 groups of caller ID number (24 digits, 10 characters and time) 8. 50 groups of outgoing call number (32 digits, talk time and date) 9. 20 groups of midi and melody options 10. 4 level ringer volume selection in hand (off/low/mid/high) 11. Tone / pulse dialing mode selection in hand 12. Recall mode selection (short, long, extra long) 13. 6-level talk volume control 14. Alarm clock can be 15. Area code (6 digits) 16. 4 level battery indication 17. 4 level LCD contrast 18. Auto answer 19. Room monitor 20. Baby call function 21. Walkie talkie function (hand -to-hand intercom function) 22. Multi-language 23. Ability to participate in Skype multi-party conference calls 24.Secure and encrypted communication 25. Caller ID (CLIP) and call waiting 26. Call transfer between hand s 27. Key pad lock 28. Plug and dial, easy to install, easy to use 29. Future-proof: software of hand and base station can be d via the USB interface