Features: 4G Fixed Wireless Phone - Supports GSM850/900/1800/1900Mhz, caller ID, save over 100 SMS messages on the phone, 7-level earpiece volume and mute adjustable, storage for 20 missed or received calls and the last ten dialed numbers. More features are detailed in the user manual. Powerful Battery - Built-in 3000mAh NiMH battery provides up to 2.5 hours of talk time and 150 hours of standby time (depending on network environment). Multifunctional Phone - Not just for calls, it also features an alarm clock and FM radio. Great for Seniors - Large buttons and clear font make it easy to use for the elderly. External Antenna - External antenna ensures a more stable signal, eliminating disconnection issues and ensuring clear call quality and smooth communication. Specification: Model: F317 Color: Black Network Support: GSM Size: 196 x 152 x 51mm Battery: 3.7V 3000mAh GSM Frequency: 850/900/1800/1900MHZ AC 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