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. Multinational system language - Chinese, English, French, Spanish, Portuguese 5 languages provide you to choose, you can set up the language you need. 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. Specifications: Type: ETS-6588 Shell Color: Black Shell Material: Plastic 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)