In telecommunication, a burst transmission or data burst is the broadcast of a relatively high-bandwidth transmission over a short period. Burst transmisssion can be intentional, broadcasting a compressed message at a very high data signaling rate within a very short transmission time. The PKI 2705 Burst Transmitter is a robust and compact audio transmission system with higly interesting features. Not only the output power of 150mW, but also the 80 frequency channels and the additional digital encryption are prerequisites for many security authorities. The use of different microphones for different surveillance applications, such as a hole microphone to listen through the wall, contact microphone to listen through doors, windows etc. or the use of a waterproof microphone for outdoor surveillance. With the PKI 2705 Burst Transmitter this is possible.