Introduction: GSM900Mhz/DCS1800MHz/PCS1900Mhz network ,It has higher receive sensitivity and better interference resistance ability ,It can supply customer with credible speech service and other multiplication service in the area of effective network bestrow. And solve the communication problem effectively where cable telephone can't reach in. The telephone is suitable in metro, speedway, ship, mine, power plant ,parking lot, steel plant, big engineer and etc ,which used in the serious environment with special requirement of waterproof, dustproof ,explosive proof ,anti-jamming and so on. Main features of product: 1、 Cabinet：aluminum alloy die－casting，high anti-violent, able to glisten, convenient for looking for ( optional). 2、 Door cover：orient automatically and good self－closing，convenient for use. 3、 Handset：made of special engineering plastic，high anti-knock resistance、high tensile strength resistance and high anti-violent. 4、 Phone is provided with high stability，high anti-jamming capability，and it is up to national standard GB/T 15279-94. Main technical requirement: 1. Applicable for various types of SPC exchange and dispatching exchange system with feeding voltage of 48-69V. resistance：600Ω 2. 2in1 design ， one set of WFT can connect two sets of telephone, which can transfer to each other. ? Caller ID . ? Can dialing IP and local phone. ? Auto add IP access code or long distance code and local code. ? Use with standard fee charger or central management charger connection. ? Receiving and Transmitting SMS through PC. ? Auto-lock SIM card selectable ， stochastic PIN code or fixed PIN code selectable. ? signal inspector , AC/DC adaptive. ? Battery inside: can last 180-220 hours and even longer according to customers requirement.