HKW30 wireless module is the use made of Silicon Laboratories' Si4432 devices, SI4432 is a highly integrated wireless ISM band transceiver chip. He has very high receiver sensitivity (-121 dBm), together with the industry-leading +20 dBm of output power, known as the "wall king," said. This module uses SI4432-B1 version of IC design, reliable performance, do not crash. Effective communication distance 800-1000 m, at a low rate as far as 1800 meters. Lead-free design, the product is easy to detect through RHOS; harmonic small, easily detected by electromagnetic interference. Small size. The module has a high cost, it is the ideal choice for 100 m to 1000 m between the actually applied. Second, the characteristics 1, frequency range: 433/868 (customizable 240-930MHZ) 2, sensitivity: up to -121dBm 3, the maximum output power: 13dBm 30mA @ + 13dBm (emission) 100mA @ 20dBm 4, the data transfer rate: 0.123- 256kbps 5, modulation mode: FSK, GFSK and OOK 6, power supply: 1.8-3.6 V 7, ultra-low-consumption shutdown mode 8, digital received signal strength indication (RSSI) 9, 10 timed wake-up function, automatic antenna matching and two-way switch control 11, 12 can be configured packet structure, the preamble signal detection 13, 64 bytes receive data register (FIFO) 14, 15 low power detection, temperature sensors and eight digital converter 16, the working temperature range: -20 to + 60 ° C 17, 18 integrated voltage regulator, frequency hopping function 19, 20 power-on reset function, built-in crystal error adjustment function Third, the application range of the wireless ordering machines, industrial remote control, remote telemetry, queuing systems, small wireless network, wireless meter reading, access control systems, paging, industrial data acquisition systems, small wireless data terminals, security, fire protection systems, wireless remote control systems, bio-signal acquisition, hydrological and meteorological monitoring, robot control, wireless alarm systems, etc.