Features: Fixed Wireless Phone - Our Desk Phone support dual SIM cards and several GSM frequency including 850/900/1800/1900MHZ and 2G network as well. Multi-function phone - It can speed dial, record 50 groups of call records for your convenience and other regular functions. In addition to regular functions, there are radio, alarm clock functions. A telephone brings more functions. Multinational system language - Chinese, English, French, Spanish, Portuguese 5 languages provide you to choose, you can set up language you need. Powerful battery - Built-in 1000mAh li-ion battery provides up to 5 days of battery without having to worry about suddenly running out of . 7 levels of brightness adjustment - Depending on ambient light, you can adjust display font brightness to ensure clear content display. External antenna - External antenna makes signal receive more stable, get rid of trouble of disconnection, ensure every call sound quality clear, unimpeded communication. Specifications: Type: ETS-6588 Shell Color: Black Shell Material: GSM Frequency: 850/900/1800/1900MHZ Battery: 3.7V 1000mAh Li-ion Battery 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: 1 * Cordless Phone 1 * Charging Cable 1 * Coil Cord 1 * Built-in Li-ion Battery 1 * User Guide(English) Fixed Wireless Phone - Our Desk Phone support dual SIM cards and several GSM frequency including 850/900/1800/1900MHZ and 2G network as well. Powerful battery - Built-in 1000mAh li-ion battery provides up to 5 days of battery life without having to worry about suddenly running out of power. 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. 7 levels of brightness adjustment - Depending on the ambient light, you can adjust the display font brightness to ensure clear content display. Multinational system language - Chinese, English, French, Spanish, Portuguese 5 languages provide you to choose, you can set up the language you need.