GDR2-4DOUT is a VHF/UHF frequency wireless receive module of superheterodyne rolling code. The module is based upon market抯 feedback and a lot of customers?advice. It shocked in the electronic products market. It has a widely application in GSM/GPS system , brake, automatic door system, and other where need wireless remote control. It adopting to SAW and rolling code coder HCS301 of MICROCHIP company, has no regulable component, insure the frequency don抰 excursion in anywhere, adopting SMT import component which have excellent stability, the frequency have no excursion or distance don抰 change when librated or high/low temperature. It has excellent reliability and stability, can avoid the disadvantage of regenerative circuit which liable to be interfered and low reliability. This receive system is a perfect choice where need high demand. Characteristic as follows： （1） Enhance the anti-jamming ability from the mobile telephone, improve decoding waveform.. （2） The receive distance is twice of others?（it can solve the problem of the rolling code losing effectively）！ （3） It has reasonable receive band width, strong anti-jamming, it can adapt to kinds of condition. （4） It has excellent ability of suppress assemble or scatter radiation, easy pass kinds of instrument. （5） Due to excellent shield ,it can adapt kinds of installing environment, consistency is nicer. （6） It has ability to restrain the radiation, can worked with several pieces module (one transmit module with several receive module ), and have no interference to each other, and don抰 influence the receive distance. （7） Adopting the SAW, insure the frequency have no excursion when librated or high/low temperature. the capability is immobile, and the temperature range is wide. （8） Frequency：433 / 315MHz。 （9） Adopting keeloq code hopping of MICROCHIP company, rolling code coder and decoding(PIC SCM),it has 40 hundreds million kinds of rolling code arrange in pairs or groups, will not repeat and has good secrecy, it can prevent cope and scan.