Upgrade of One R9: The MAX2837 was replaced by the MAX2839. The Si5351C is replaced by the Si5351A with additional clock distribution. Add a series diode to the power supply of the antenna port. for One is a software-defined radio peripheral capable of transmitting or receiving radio signals from 1 MHz to 6 GHz. Designed to support the testing and development of modern and -generation radio technologies, for One is an open source hardware platform that can be used as a USB peripheral or programmed for stand-alone operation. Notice: 1. Supports the latest firmware, the current firmware defaults to firmware v1.7.3. 2. For some functions, such as world map, GPS simulator, etc., you need to prepare PortaPack H2 and a -SD card in FAT32 format of 1G or above. Colour:Green Material:Plastic Package Contents: 1 x for One board 1 x cable 1 x antenna Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.