Content - invisity Ear Prompter - RF Receiver


    • Product

      invisity ear prompter

      The invisity ear prompter by Phonak is the smallest in-ear RF receiver in the world and the perfect choice for presenters and performers who require crystal clear audio prompts.

      invisity is completely wireless, sits invisibly inside the ear canal, and weighs just 1.5g. It offers total freedom of movement and is ergonomically designed for day-long wearer comfort.

      Today invisity is used and trusted by broadcasters and filmmakers worldwide.

      Two versions are available:

      invisity 4-channel

      4 channels (7 MHz range). Supplied with invisity remote control (pictured left) for discrete channel flicking. Additional adjustable parameters.

      invisity flex

      1 channel (7 MHz range), programmable via the optional invisity programming unit (IPU) or through a Phonak dealer.

    • Technical

      A closer look at invisity's technical specifications.

      fixed or programmable (single or multi), 7MHz band
      Frequency response
      200 Hz - 4500 Hz
      Audio signal output94 dBSPL measured in a 1.3 cc ear simulator (Volume 1 default setting), 102 dBSPL measured in a 1.3 cc ear simulator (Volume 2 default setting),
      or adjustable on 4-channel model
      Noise filtersquelch
      SensitivitySINAD >17 dB @ E=3mV/m
      Channel selectivity>50 dB (at 200 kHz channel spacing)
      Antennamagnetic, integral
      Spurious emissionsbelow -57 dBm ERP
      Distortion>5% (depends on volume setting)
      Dimensions19 x 12 x 12mm (0.74" x 0.47" x 0.47")
      Weight1.5 g (inc. battery)
      Battery life 13 h (constant reception) using Phonak battery
      Power consumption3.3 mA
      SNR (signal over noise ratio)approx. 41dB in the AGC @ 1 kHz
    • Transmitters

      Several transmitter options exist for the invisity listen only earpiece. These include:

      Phonak TX300V

      The TX300V (shown left) is the ideal 9.5-inch transmitter for long range use with Phonak invisity. It features:

      • Frequency range of 150-220 MHz
      • 20 frequency settings
      • 2 adjustable length radials
      • Remote antenna with mounting bracket

      The TX300V is fully programmable, fully resistant to temperature extremes and humidity, and available with PTT (with/without VOX function).


      The inspiro transmitter is a comfortable, belt-worn FM device designed for use over short distances. It is available with a lapel- or face-worn mic, features 40 channels, runs for up to 13 hours, and does not require any frequency allocation.


      EasyLink is a simple yet effective voice transmitter. It features a single Zoom microphone mode, an audio input, and can be held in the hand or hung around the neck.