Motorola HKLN4599 Earpiece

What is the Motorola HKLN4599?

The Motorola HKLN4599 (also sold as part number 56517) is a D-style earpiece with an in-line push-to-talk (PTT) microphone, designed for use with Motorola two-way radios that accept a 2-pin slim connector. It is compatible with the CLS, RDX, RM, DTR, DLR, Motorola-Series radio lines. The accessory allows users to transmit and receive hands-free without removing the radio from its holster, making it suited for fast-paced, communication-intensive work environments.

Specifications

Compatible Motorola Radio Models

Note: The HKLN4599 uses a 2-pin slim connector. It is not compatible with Motorola radios that use a different connector format, even if the plug appears similar. Always verify the connector type on your specific radio model before ordering.

What's in the Box

• 1 × Motorola HKLN4599 D-style earpiece with integrated D-ring ear hook
• In-line PTT microphone with lapel clip (attached to cable)

No additional adapters or batteries are required. The earpiece connects directly to the radio's accessory port.

Who This Product Is For

The HKLN4599 is a single-wire earpiece used across a wide range of business environments where hands-free radio communication is required and discretion or comfort over a long shift is a priority.

Retail: Floor associates at grocery stores, home improvement centers, and department stores use this earpiece to communicate across departments without interrupting customer interactions. It is frequently paired with the CLS1110 and CLS1410, which are common in high-volume retail settings.

Restaurants and hospitality: Front-of-house staff, hosts, and event coordinators benefit from the discreet profile of the D-ring design. The earpiece keeps audio close to the ear in loud dining environments without requiring staff to raise the radio to their face.

Education: School administrators, security staff, and event coordinators on K-12 and university campuses use this accessory with the RM Series and RDX Series radios for low-profile communication during school hours.

Healthcare and dental offices: Clinical and administrative staff who need to communicate without creating noise in patient areas use this earpiece to receive radio calls discreetly. The smooth plastic surface can be wiped down with an alcohol pad between users, which is relevant for shared-radio deployments in clinical settings.

Warehousing and manufacturing: Workers in loud industrial environments clip the PTT button to their collar or shirt and listen through the earpiece while keeping both hands on tasks. Compatible with the DTR Series, which operates on 900 MHz FHSS and is common in facilities with high RF interference.

Security and event staff: Security personnel and event coordinators favor the D-ring style for extended shifts because the over-ear hook keeps the earpiece in place during movement without fitting inside the ear canal, reducing fatigue compared to in-ear monitor styles.

Shared radio fleets: Because the earpiece sits outside the ear canal and has a smooth wipe-down surface, it is a common choice for operations where multiple employees use the same radio across shifts — such as car washes, theaters, and amusement venues.

Key Features

• D-ring over-ear design positions the speaker at the opening of the ear canal without inserting into it
• Ambidextrous — the ear hook can be worn on either the left or right ear
• In-line PTT button with lapel clip keeps the microphone near the mouth and the button accessible without reaching for the radio
• VOX capable — compatible with voice-activated transmission when the paired radio supports VOX mode
• Smooth plastic housing is cleanable with an alcohol wipe, supporting shared-use deployments
• Single-wire design — one cable runs from the radio port to both the earpiece and the in-line mic/PTT module
• 2-pin slim connector provides a secure, audible connection to compatible Motorola radios
• Backed by a one-year manufacturer warranty
• Compatible with over 50 Motorola radio models across the CLS, RDX, RM, DTR, DLR, XTN, AX, and select M/CP/SP series

Frequently Asked Questions

What radios is the Motorola HKLN4599 compatible with?

The HKLN4599 is compatible with Motorola two-way radios that use a 2-pin slim connector. This includes the CLS Series (CLS1110, CLS1410), RDX Series (RDU2020, RDU2080D, RDU4100, RDU4160D, RDV2020, RDV2080D, RDV5100), RM Series (RMU2040, RMU2080, RMU2080D, RMM2050, RMV2080), DTR Series (DTR410, DTR550, DTR600, DTR650, DTR700), DLR Series (DLR1020, DLR1060). It is not compatible with Motorola radios that use a different connector format.

What is the difference between the HKLN4599, HKLN4599A, HKLN4599B, HKLN4599C, and HKLN4599D?

The letter suffix designates a product revision or regional variant. The core design — D-ring earpiece, in-line PTT microphone, 2-pin slim connector — is consistent across all suffix variants. Compatibility and function are the same. Motorola issues new suffix letters as part of standard product lifecycle management. When ordering a replacement, any current suffix variant will serve the same function as the prior revision.

Is the HKLN4599 a surveillance-style earpiece or a standard earpiece?

The HKLN4599 is a standard D-ring style earpiece, not a surveillance or acoustic tube earpiece. The speaker is housed in a plastic D-shaped loop that sits against the outer ear. This design is less discreet than a clear acoustic tube earpiece but more comfortable for extended wear and easier to clean between users. For applications requiring a true surveillance earpiece (speaker inside the ear canal, tube routing behind the ear), Motorola offers separate accessories such as the HKLN4606 or similar models.

Can multiple employees share one HKLN4599 earpiece across shifts?

Yes. Because the D-ring speaker sits outside the ear canal rather than inside it, the earpiece can be wiped down with an isopropyl alcohol pad between users. This makes it a practical choice for shared-radio deployments in retail, hospitality, healthcare, and industrial settings. In-ear monitor style earpieces, by contrast, are generally considered single-user accessories due to hygiene.

Does the HKLN4599 support VOX (voice-activated transmission)?

Yes, the HKLN4599 is VOX capable. Whether VOX mode is available in practice depends on the paired radio — the radio must support VOX in its firmware and settings for hands-free voice activation to function. Motorola radios such as the CLS1410, RMU2080, and DTR700 support VOX mode and can be configured to work with this earpiece without pressing the PTT button.

Is the HKLN4599 compatible with the Motorola DTR600 and DTR700?

Yes. The DTR600 and DTR700 use the same 2-pin slim accessory connector as the DTR Series predecessors (DTR410, DTR550, DTR650), and the HKLN4599 is confirmed compatible with both models. If you are deploying the DTR600 or DTR700 in a facility and need a shared-use audio accessory, the HKLN4599 is a supported option.

How do I install the HKLN4599 on my Motorola radio?

Turn the radio off before connecting the earpiece. Insert the 2-pin connector into the radio's accessory port and press firmly until you feel a double-click, which indicates the connector is fully seated. The earpiece should not pull free easily when connected correctly. Common installation issues — such as intermittent audio or no audio at all — are typically caused by a partially seated connector. Once connected, turn the radio on. The earpiece is now active for both transmit (via the PTT button) and receive.

Related Products

Compatible Radios

• Motorola CLS Series Two-Way Radios — CLS1110, CLS1410
• Motorola RDX Series Two-Way Radios
• Motorola RM Series Two-Way Radios
• Motorola DTR Series Two-Way Radios — DTR600, DTR700
• Motorola DLR Series Two-Way Radios

Accessories by Series

• Motorola CLS Series Accessories
• Motorola RDX Series Accessories
• Motorola RM Series Accessories
• Motorola DTR Series Accessories
• Motorola DLR Series Accessories

External Resources

• Motorola Solutions — Official HKLN4599 Product Page