feature: is an open source 2.4 GHz wireless development platform for experimentation. Based on the powerful Cortex-M3 LPC175x microcontroller and full-speed USB 2.0, the is an excellent way to develop a class 1 custom device of its kind. The entire board is only two and a half inches long, with a USB-A connector on end and an RP-SMA connector on the other. The difference between and other development platforms is that it can not only send and receive 2.4GHz signals, but also work in listening mode to monitor traffic in real time. This mode of has existed in low-cost WiFi modules for many years and has been widely used in research, development, and security audits, but so far, the standard has not had such a solution. Also, since it is an open source platform (software and hardware), schematics and are readily available for all your hacking needs. Specification: 2.4GHz transmit and receive. Transmit power and receive sensitivity are comparable to Class 1 devices. Standard Cortex debug connector (10-pin 50K JTAG). In- Programming (ISP) Serial Connector Expansion connector designed for communication between Ubertooth or other uses. Six LED indicators 2.4 GHz duck antenna included Note: To open the schematic and board design files in the source package, you need to download the KiCad tab, the open source electronic design automation package. Dimensions: 61.75 mm x 19 mm (2.43 x 0.75 in) Package list: 1* 2.4GHz open source test and research tool 1* Dual Band WiFi Antenna notes: 1. Due to manual measurement, please allow 1-3mm error. 2. Due to the difference of different monitors, the picture may not reflect the actual color of the item. Thanks!