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Sound Quality

The HS-500 features an amplified differential electret microphone for superior noise cancellation and an audiometric dynamic receiver for excellent frequency response with low distortion. Due to its noise-cancelling characteristic, it may be used near PA speakers without experiencing feedback. The handset is extremely resistant to radio frequency interference and 400Hz hum.

Ease of Service

The microphone and receiver caps are removable for internal servicing. The electret microphone element and amplifier are contained in a single module. Both the microphone-amplifier module and the receiver element are replaceable without soldering or cutting.

Cordage and Plugs

Cordage is strain-relieved at the handset and plug for maximum strength. Cord and plug configurations are available to meet a variety of user requirements,


The HS-500 handset contains Push-to-Talk for ease of use.

FAA TSO Approval

The HS-500 handset is approved for aviation use under FAA TSO C57 and C58.
Color Black
Cord Length 7 ft (2.1336 m)
Frequency Response 20 Hz - 4 kHz
Impedance 600 Ω
Microphone Frequency Response 100 Hz - 10 kHz
Microphone Impedance 50-600 Ω
Microphone Sensitivity -55 +/- 3 dBV/Pa
Microphone Type Noise-Cancelling Electret
Power Requirements 8-30 Vdc
Speaker Dynamic, Audiometric
Speaker Sensitivity 109 SPL/mW
Weight 11.99 oz (340 g)


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Telex is part of the Bosch Communications Systems family of brands, offering the world's most complete portfolio of professional audio and communications solutions.

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