Features: <> Fixed - Our Desk support dual SIM cards and several GSM frequency including 850/900/1800/1900MHZ and 2G network as well. <> Multi-function - It can dial, record 50 groups of call records for your convenience and other regular functions. In addition to the regular functions, there are , functions. A brings more functions. <> Multinational system language - Chinese, English, French, Spanish, Portuguese 5 languages provide you to choose, you can set the language you need. <> Powerful - Built-in 1000mAh li-ion provides to 5 days of without having to worry about suddenly running out of . <> 7 levels of brightness adjustment - Depending on the ambient , you can adjust the display font brightness to ensure clear content display. <> External - External makes the signal receive more stable, get rid of the trouble of disconnection, ensure every call sound quality clear, unimpeded communication. <> <> Specifications: <> Type: ETS-6588 <> Color: Black <> Material: <> GSM Frequency: 850/900/1800/1900MHZ <> : 3.7V 1000mAh Li-ion   <> LCD Backlight Function: Support <> Item Size: 25 * 20 * 6.8cm / 9.8 * 7.9 * 2.7in <> Package Size: 25 * 20 * 7cm / 9.8 * 7.9 * 2.8in <> Package Weight:650g / 22.9oz <> <> Package List: OS4821US <> 1 *  Cordless <> 1 * Cable <> 1 * Coil Cord <> 1 * Built-in Li-ion   <> 1 * User Guide(English) <> <>