EZSync CC2540 Evaluation Module USB Dongle, BLE Bluetooth 4.0, CC2540EMK-USB compatible, Configured as PACKET SNIFFER The package contains 1x CC2540 USB Dongle. Please refer to "technical specification" section of this Amazon page for a quick user guide The device connects to a Windows PCs USB port, and is pre-loaded with PACKET SNIFFER firmware, work with Packet Sniffer analyzing the BLE protocol and for software and system level debugging. Re-programming requires CC Debugger, EZSync106 or SmartRF05EB board support(not included) The device can be reprogrammed to be a BLE DEVICE MONITOR and work with BLE Device Monitor and BTool to display services, characteristics and attributes of any Bluetooth low energy device including TI sensortag monitoring and OAD