Features: 2G Fixed Wireless Phone - Support GSM850/900/1800/1900Mhz, Caller ID, Save more than 100 SMS on the phone, 7-level headphone volume and silence adjustable, Storage 20 missed call or received calls and the last ten dialed number. More functions will be described in user manual. Powerful battery - Built-in 3000mAh NiMH battery provides up to 2.5hrs of talk time and 150hours standby time.(depending on network environment) Multifunctional Telephone - It not only just a tool to call, but an alarm clock and having FM radio function. Great for Elder People - With big button and the font is clear and age-friendly. External Antenna - External antenna makes the signal receive more stable, get rid of the trouble of disconnection, ensure every call sound quality clear, unimpeded communication. Specification: Model: F317 Color: Black, White (Optional) Network Support: GSM Size: 196 x 152 x 51mm Battery: 3.7V 3000mAh GSM Frequency: 850/900/1800/1900MHZ Switching Power Supply: AC:100-240 V; DC:5.00 V,0.65 A Display:128X64 dot array LCD Screen. Package Weight: 700g/26.5oz Package Size: 27 x 19 x 5.5㎝/10.6 x 7.5 x 2.2in Packing List: 1 x Telephone Transmitter 1 x Telephone Receiver 1 x Telephone Line 1 x Battery 1 x User Manual