"THE THOR DIGITAL SURVEILLANCE SYSTEM (407 TO 420 MHZ) IS A FULL FEATURED PORTABLE DIGITAL AUDIO LISTENING AND RECORDING SYSTEM (2GB). THE PRIMARY COMPONENTS ARE SEVERAL DIFFERENT TYPES OF DIGITAL STEREO TRANSMITTERS ALONG WITH SOME ANALOG BEOWULF TRANSMITTERS. KIT INCLUDES TWO THOR RECEIVERS, THOR REPEATER FILTER, THOR TRANSMITTERS, BODY WORN TRANSMITTERS, THOR BELT TRANSMITTER, COVERT ANTENNA WHIP ANTENNA KETFOB, KEYFOB CHARGER, BATTERY PACKS AND MICROMAINS POWER ADAPTERS."