Under line-of-sight conditions out in the open, the units may operate over a distance of 150 feet or more. Indoors, where there are reflections, the units should maintain communication over a distance of 15 to 20 feet even if the Listener and Talkers occasionally turn their backs to each other.

Technical Specifications

Power Consumption: 50-65 mA at nominal voltage

Battery Life: 10-13 hours

Charging Time: Typically 2-3 hours from “empty”

Environmental Performance: Operating: -10 to +45 °C

Charging: 0 to +35 °C

Storage: -10 to +45 °C

Radio Performance: 20 meters (66 feet) min in free space

Audio Performance:

Frequency Bandwidth: 8 kHz (7 kHz for two-way system)

Acoustic Insertion Gain at Startup (preset volume): 20 dB gain

Volume Control Gain Range: 4 dB to 66 dB*

Maximum output: 119 dB SPL*

Total Harmonic Distortion: < 2%

End-to-end Delay: 22-32 msec (low-interference environments);

                                30-40 msec (four microphone systems)

Earphone Minimum Output Impedance: 10 Ohms

Telecoil Minimum Output Impedance: 10 Ohms

Max Voltage Swing at Receiver Output: 1.95-2.00 Vpp

Antenna: Internal

Microphone: Noise-canceling electret condenser

*Notes:

1. Gain and output depend on the earphone that is used. These specifications apply when the Companion Mics system is used with the supplied 6i Isolator^™ earphones.
2. Maximum output is measured into a 2cc coupler with 90 dB SPL input.
3. Technical note for audiologists: When a hearing aid microphone is moved from the ear of the listener to a position a few inches below the talker’s mouth, an increase of 16-20 dB SPL is obtained. Insertion gain refers to the increase in ear canal SPL provided by the Companion Mics system compared to listening directly to a talker one meter in front of the listener.