Leads out download interface and frequently-used IO port standard 2.0mm pin connector open frequency band; Working frequency band is 2.4GHz; Wireless transmission rate up to 1Mbps; Power consumption: receiving current<20mA emission current<25mA; Using PCB antenna extend receive distance; Works with SmartRF Packet Sniffer can achieve Bluetooth low power consumption BLE protocol analyzer function; Works with CC2540_USBdongle_HostTestRelease_All.hex firmware can use BTool as PC upper computer; Official design compatible with all official application; Super narrow border design