TX300V : The TX300V is the ideal 9.5; transmitter for use with Phonak’s invisity in-ear receiver. Offering a frequency range of 150-220 MHz and 20 frequency settings, the TX300V is fully programmable and resistant to temperature extremes and humidity. 2 inputs, Phantom Power, designed for Phonak Invisity Earwig, guide U, programable. Includes Power Supply and Dipole Antenna.