There are currently 2 types of wireless microphone technology, Bluetooth and DECT (Digital Enhanced Cordless Telecommunication).
Bluetooth does not provide the range or bandwidth to provide the signal quality needed for voice recognition. It comes with a small USB transceiver for sending and receiving transmissions which is easily plugged into and removed from a computer. Bluetooth has a range of up to 10 feet depending on the environment. The headset generally has an a/c charging adapter that attached separately. They have typical battery life of 4-6 hours depending on use. While they are Bluetooth microphones that are compatible with Dragon the signal quality, lack of distance and battery life insufficient for 6 to 8 hours make this technology make it a mediocre choice for wireless microphone voice recognition.
DECT does provide a high quality signal for voice recognition but it requires a large base station for both charging and send/receiving transmissions with the wireless microphone. DECT have a range of up to 300 feet depending on the environment. The base station will have both a USB cable and an a/c adapter that need to be attached. The typical battery life is between 6-10 hours depending on use. The superior range, quality and battery life of this technology make it the BEST choice for wireless microphone voice recognition.