说明：  A7139是基于的A7139无线收发芯片设计，是一款完整的、体积小 巧的、低功耗的无线收发模块。A7139是一个ISM频段无线收发芯片，主要设定为315/433/470/868/915/MHzISM/SRD频段，最大输出功率可达20dBm，最高传输速率达250Kbps。用户不需要对射频电路设计深入了解，就可以使用 本模块轻易地开发出性能稳定、可靠性高的无线产品
(A7139 is based on A7139 wireless transceiver chip design, is a complete, compact, low power wireless transceiver module. A7139 is a ISM band wireless transceiver chip, the main set for the 315/433/470/868/915/MHzISM/SRD frequency band, the maximum output power up to 20dBm, the maximum transmission rate of 250Kbps. Users do not need in-depth understanding of RF circuit design, you can use)