The Panasonic Wireless Desktop Transmitter (Model: WX - ST600) is a state - of - the - art wireless base designed specifically for Panasonic's 18 - inch gooseneck microphones. Operating on a 1.9 GHz DECT frequency, this transmitter ensures stable sound capture and transmission, delivering excellent sound quality and clarity over a wide area with minimal interference. It features two operation modes: Always ON and Push - To - Talk (PTT), allowing for flexible usage depending on your needs. The talk switch can be used to toggle the microphone ON/OFF or to activate PTT while held down. Additionally, the transmitter includes a 4 - level volume indicator and can be controlled externally from the receiver side. With a battery life of approximately 13 hours using two Ni - MH AA batteries, it also offers a 3.5 mm audio input for connecting external sound sources, making it a versatile choice for various audio applications.