The GSM Wireless Desktop Telephone support 2 SIM card(Not included) with a working frequency  GSM 900/1800 MHZ. Easy to setup with no ground wire needed. Phone has a superior service quality with a strong Easy & Simple to Use: Can be put on desk or wall mounted. Widely used in family house, office, hotel or telephone shops etc.Features include: Ideal for Homes & Offices, Universal supports all networks, Dual sim, LCD display with green backlight, Handsfree and speaker phone, Caller ID, SMS Functions, FM, Clock display and alarm function, Mute function, TNC antenna, GSM 900/1800 MHZ, Strong quality Rechargeable battery 2000mAh, High Capacity phone book, Micro SD Slot & Sound Recording. Can be put on desk or wall mounted. Widely used in family house, office, hotel or telephone shops etc.