Digital Body Wire Systems Conventional analogue body wire systems suffer from vulnerability to monitoring. They are also susceptible to drop-outs if the transmitter moves out of range and temporary loss of communication results. On the receiver side, the usage of audio cassette recorders to record conversations is inconvenient and prone to mistakes. The DFH-DAR-902 digital spread spectrum body wire system changes all that by offering: Unique TriMode(TM) modulation system (choice of three operating modes - three devices in one!) Digital encryption for unbeatable security Frequency hopping spread spectrum for safety from detection Digital audio recording in both the transmitter and receiver Multiple receiver capability User programmability The Transmitter Contained in an elegant black aluminium case, the transmitter measures 55 x 87 x 19 mm (2.2 x 3.4 x 0.7 inches) and works on four standard AAA batteries. The maximum power is 400 mW. The in-built digital audio recorder has over sixty minutes of recording capacity. The recorded audio remains preserved even when batteries are removed. The transmitting function can be disabled, making it possible to deploy the device as a solid state recorder only. The transmitter contains a sensitive microphone with a connector for an external one. There is also a serial data connector for interfacing to the base receiver, for the purpose of programming the transmitter and for downloading the recorded audio. The transmitter can operate in one of three possible modes: "hi-fi" analog, digitally encrypted, and frequency hopping spread spectrum. The selection between these three modes can by done by connecting the transmitter to the receiver via a programming cable, and selecting the mode using the receiver keypad - simple instructions are clearly shown on the in-built LCD display of the receiver. In a similar way, the transmitter can be also programmed to one of three possible power settings. This has a direct effect on the transmission range and the battery life. The transmitter can be also connected to the parallel port of a PC via a special high-speed interface adaptor. This makes it possible do download the recorded audio directly to a PC in a standard WAV format, and play it back immediately using standard multi-media capabilities of a PC. The recorded audio can be also downloaded to the recording memory of the receiver and played back from there. http://www.sst.com.au/bodywire.htm