16-channel digital voice transmission system with 863-865 MHz frequency. Suitable as a tour guide system and for any other application in which a certain voice source is to be distributed to one or more receivers. It features high resistance to interference due to digital transmission, high operating range, frequency range perfectly adapted to voice transmissions and parallel operation of up to 4 different channels possible without any interference. 16-channel miniature transmitter, for microphone operation and audio line signals. Supplied with electret tie clip microphone. It is equipped by microphone input/audio line input via 3.5 mm jack with automatic detection, depending on the configuration (mono/stereo), LCD for indicating channel and battery status, mute button and micro USB charging connection for ATS-12CB, ATS-35CB or USB charger. Supplied with lanyard. Power supply via integrated rech. lithium battery (3.7 V/600 mAh).