The BlueSMiRF HID is essentially the same board as the BlueSMiRF Silver but the populated RN-42 comes loaded with the HID firmware. HID, or "Human Interface Device," is the communication protocol used for computer peripherals such as keyboards, mice and joysticks. This makes the RN-42-HID a simple and powerful tool for creating wireless peripheral devices which can be universally recognized and used without the installation of special drivers. The manual included in the documentation below goes into more detail about the Bluetooth HID profile. Project description, more information and ordering can be found at https://www.sparkfun.com/products/10938 Datasheet (RN-42-HID): http://www.sparkfun.com/datasheets/Wireless/Bluetooth/rn-42-ds.pdf Roving Networks HID Users Manual: http://dlnmh9ip6v2uc.cloudfront.net/datasheets/Wireless/Bluetooth/RN-HID-User Guide-1.1r.pdfhttp://www.sparkfun.com/datasheets/RF/RN-24-guide.pdf