Feature list: 1.Support GSM900/1800Mhz;GSM850/900/1800/1900Mhz optional? 2. Caller ID( support DTMF & FSK) 3. Dot-matrixed display with Spanish, English, French and Portuguese optional 4. SMS function 5. Call in / Call out /Call divert/ Call waiting limitation function 6.Lock up function: SIM card, network, cell and operated company 7.Speed dial function 8. Save more than 100 SMS on the phone 9. Voice mail function 10. Storage 20 missed call or received calls and the last 10 dialed number 11. 7-level headphone volume and silence adjustable 12. Speaker Phone 13. Support three-way conference call Operating Requirements Normal operation temperature: -10 ~+ 55 Relative humidity: 10%~95% Atmosphere pressure: 86~106Kpa Operation voltage: AC220V， 50Hz，DC 5V 1000mA Battery type: Rechargeable Aluminum battery 3.7V 800mAh ( included) Standby time: 168H(7 days) Talking time: 4.8H