(Also requires $50 cash bond, which will be returned upon return of the gear)
Rodelink filmmaker kit (wireless lapel mic kit)
RØDELink represents the next generation of digital wireless systems. Using a Series II 2.4GHz digital transmission with 128-bit encryption, it is able to constantly monitor and hop between frequencies to maintain the strongest possible signal level at a range of up to 100 metres* (over 100 yards). The RØDELink Filmmaker Kit provides everything you need to start shooting video wirelessly, including a receiver, transmitter and broadcast-grade lavalier microphone.
More specs here: http://www.rode.com/wireless/filmmaker