ETSI EN 300 220-2-2018
短程设备 (SRD) 工作频率范围为 25 MHz 至 1 000 MHz； 第2部分：非特定无线电设备获取无线电频谱的协调标准
Short Range Devices (SRD) operating in the frequency range 25 MHz to 1 000 MHz; Part 2: Harmonised Standard for access to radio spectrum for non specific radio equipment