Features: 4G fixed wireless phone supports GSM850/900/1800/1900Mhz, caller ID, save more than 100 text messages on the phone, 7-level headset volume and mute adjustable, store 20 missed or received calls and the last ten numbers dialed. More functions 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 the network environment) Multifunctional phone - it is not only a tool for calls, but also an alarm clock and FM radio function. Perfect for seniors - with large buttons, clear fonts and suitable for seniors. External antenna - The external antenna makes the signal reception more stable, eliminates the problem of interruption and ensures that the sound quality of each call is clear and the communication is unobstructed. Specifications: 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: 100-240V; DC: 5.00V, 0.65A Display: 128X64 dot matrix LCD. Package Dimensions: 27 x 19 x 5.5cm/10.6 x 7.5 x 2.2in Package Contents: 1 x Phone Transmitter 1 x Phone Receiver 1 x Phone Cord 1 x Battery 1 x User Manual