You can read the specs and all of the reviews there and on other sites. Other than a lousy, hard to remember name, it is a GREAT product, packaged nicely, and is priced for under $70. I bought one and it stays on the D800 most of the time. I plan on picking up another to leave on the D4. Both the receiver and the transmitter are tiny. Read all of the reviews and you will get a better idea.