Features: 4G Fixed Wireless Phone - Supports GSM850 /900 /1800 /1900Mhz, caller ID, saves over 100 SMS on the phone, 7-level earpiece volume and mute adjustable, stores 20 missed or received calls and the last ten dialed numbers. More features are described 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 - It's not just a tool for making calls, but also an alarm clock and features an FM radio function. Perfect for Elderly People - With large buttons and clear, age-friendly font. External Antenna - The external antenna ensures more stable signal reception, eliminating disconnection issues and ensuring clear, unobstructed call audio quality. 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 Power Supply: AC:100-240 V; DC:5.00 V,0.65 A Display: 128X64 dot matrix 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 Phone Transmitter 1 x Phone Receiver 1 x Phone Line 1 x Battery 1 x User Manual