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Black single-wire earpiece with inline mic and PTT button

Motorola

Motorola HKLN4477A 1-Wire Surveillance Earpiece for RDX XTN CLS AX DTR Series

SKU CH-M88Q-SANWN

A single-wire surveillance earpiece with inline microphone and push-to-talk button enables hands-free communication with compatible Motorola two-way radios

  • TypeTwo-way Radio
  • Hands-free communication with inline push-to-talk microphone
  • Secure 1-wire surveillance earpiece for discreet listening
  • Compatible with RDX, XTN, CLS, AX, DTR series radios
  • Inline clip keeps microphone positioned for clear voice pickup
  • Ready to use with Motorola two-way radio equipment

Compatible Radio Series

The Motorola HKLN4477A is a single-wire surveillance earpiece built for Motorola RDX, XTN, CLS, AX and DTR series two-way radios. It provides hands-free communication for security, hospitality and event staff who need discreet operation. The inline microphone and push-to-talk button allow users to transmit without lifting the radio from a belt or pocket. This accessory suits professionals who require clear, private audio in noisy environments.

Installation and Common Issues

The earpiece connects via the radio's accessory port and clips to clothing for a secure fit. Installation is straightforward: plug the connector in until it seats firmly and route the wire under a shirt or collar. A loose connector is the most frequent cause of intermittent audio or PTT failure. Users should inspect the plug pins for debris and ensure the strain relief is not bent sharply, which can fracture the internal conductors over time.

Single-Wire Design Limits

The single-wire architecture carries both receive audio and transmit audio on one cable, so the microphone sits close to the earpiece rather than near the mouth. This can pick up clothing rustle or wind noise in outdoor settings. The design does not support simultaneous talk and listen; pressing the PTT button mutes the earpiece audio. Users needing full-duplex operation or a boom microphone positioned at the corner of the mouth should consider a two-wire or three-wire alternative.

Highlights

  • Hands-free communication with inline push-to-talk microphone
  • Secure 1-wire surveillance earpiece for discreet listening
  • Compatible with RDX, XTN, CLS, AX, DTR series radios
  • Inline clip keeps microphone positioned for clear voice pickup
  • Ready to use with Motorola two-way radio equipment

Specifications

BrandMOTOROLA
ModelHKLN4477A
TypeTwo-way Radio

Questions about this item

How do I verify the HKLN4477A earpiece is working correctly after connecting it to my RDX series radio?

Plug the connector into the radio accessory port, press the inline push-to-talk button and speak; you should hear your voice through the earpiece and the radio should transmit when the button is held.

What is included with the HKLN4477A and what extra items are required?

The package contains the single-wire surveillance earpiece with inline microphone, push-to-talk button and clothing clip; a compatible Motorola RDX, XTN, CLS, AX or DTR series two-way radio must be supplied separately.

Which version should I choose between HKLN4477A and HKLN4601 for my DTR series radio?

Both part numbers refer to the same single-wire surveillance earpiece compatible with the DTR series; select whichever SKU your supplier lists as available.

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