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RF-R-ASK series module are low cost super-heterodyne receiver module working at frequency 433Mhz. The operating voltage is 3.6V-5.5V. Enable(SHUT)function, which enable module to switch between work status and sleep status, other shape modules don’t have this function. This module features stable RF performance, low power consumption, high sensibility, cost-effective, widely applied in various types of data transmission system.