Motorola 53866 Earbud with In-Line Microphone and Push-to-Talk

What is the Motorola 53866?

The Motorola 53866 is a 2-wire earbud and in-line push-to-talk microphone accessory designed for use with Motorola two-way radios using the standard 2-pin connector. The accessory routes audio directly to the ear via a pellet-style earbud while a clip-on microphone with a PTT button mounts to a collar, lapel, or sleeve. It is compatible with a broad range of Motorola business radio series including CLS, RDX, RM, DTR and others.

Specifications

What's in the Box

• 1 × Motorola 53866 earbud with in-line PTT microphone assembly

No batteries, adapters, or additional accessories are included. The accessory connects directly to the 2-pin accessory port on compatible Motorola radios.

Who This Product Is For

The 53866 is suited to environments where hands-free awareness and discreet communication are priorities. It is not a surveillance-grade tactical headset — it is an everyday business accessory for workers who need to receive and transmit radio calls without holding a radio to their face or causing a disruption to bystanders.

Common Industries and Use Cases

Retail and Hospitality

Floor associates and front-of-house staff can coordinate without disrupting customers. The low-profile earbud and lapel mic keep communication unobtrusive in customer-facing settings such as hotels, restaurants, and retail stores.

Security and Loss Prevention

Security personnel benefit from keeping their hands free and their radio communication private. The earbud routes audio away from room speakers, reducing the chance of communications being overheard by those nearby.

Healthcare and Assisted Living

Staff who need to stay connected in quiet clinical environments — including hospitals, dental offices, and assisted living facilities — can communicate without the radio speaker broadcasting to patients or residents.

Education

School administrators, campus security, and event staff can use this accessory to maintain radio contact in hallways and classrooms without creating a distraction.

Warehousing, Manufacturing, and Industrial

Workers in high-noise environments where conversation clarity is harder to achieve can use the in-ear audio to hear radio transmissions more clearly without increasing speaker volume.

Film, Theater, and Event Production

Stage managers, production coordinators, and venue staff frequently use clip-mic earpiece combinations to maintain real-time communication without visible headgear or interfering with audience experience.

Car Washes and Outdoor Operations

Workers who are on the move outdoors and need to communicate across a site without stopping to retrieve a radio from a belt or pocket.

Key Features

• 2-wire design with separate earbud and clip-on microphone leads
• Pellet-style earbud fits either ear; mutes the radio speaker and directs audio to the ear canal for more private listening
• In-line PTT button on the microphone cord; user activates transmission without touching the radio
• Microphone attaches to collar or lapel via spring-loaded clip
• Compatible with a broad range of Motorola two-way radio series via standard 2-pin connector
• Radio remains on the belt or in a holster during use
• Low-profile black design blends with standard work uniforms
• 1-year replacement warranty
• Also listed under Motorola part numbers 53866A and HMN9025 / HMN9025A

Compatible Radio Models

The 53866 is designed for Motorola radios equipped with the standard 2-pin (M1) accessory connector. Verified compatible series and specific models include:

If you are uncertain whether your radio uses the 2-pin connector, check the accessory port on the top of the radio or consult the radio's user guide. Motorola radios with a proprietary multi-pin connector or USB-C accessory port are not compatible with this accessory.

Frequently Asked Questions

What radios is the Motorola 53866 compatible with?

The Motorola 53866 is compatible with Motorola two-way radios that use the standard 2-pin (M1) accessory connector. Compatible series include the CLS, RDX, RM, DTR, AX, XTN, X, CP, GP, BPR, CT, P, PR, SP, M, and VL Series radios. Specific confirmed models include the CLS1110, CLS1410, RDU2080D, RMU2080, DTR550, AXU4100, CP200, and many others. The accessory is not compatible with Motorola radios that use a different connector standard, such as MOTOTRBO radios with proprietary multi-pin connectors.

Is the Motorola 53866 still being manufactured?

The 53866 has been discontinued by Motorola Solutions. The current replacement is the Motorola HKLN4604 Swivel Earpiece with In-Line Microphone and PTT, which shares the same 2-pin connector and is compatible with the same radio series. Stock of the 53866 remains available from some authorized dealers while supplies last.

Does the Motorola 53866 work with both ears?

Yes. The pellet-style earbud is designed to fit comfortably in either the left or right ear. The microphone clip and PTT button are on a separate cord, so ear preference does not affect microphone placement or PTT operation.

How do you install the Motorola 53866 on a radio?

Turn the radio off before connecting the accessory. Align the 2-pin plug with the accessory port on the top or side of the radio and press firmly until you feel or hear a double-click, indicating the connector is seated. The plug should not pull out easily once properly connected. Turn the radio back on. If the earpiece is not functioning, power cycle the radio and check that the connector is fully seated. Common issues such as intermittent audio are usually caused by an incompletely seated connector.

What is the difference between the Motorola 53866, 53866A, and HMN9025?

These are all the same product. Motorola Solutions uses suffix letters (such as "A") after stock numbers to indicate minor production revisions. The HMN9025 and HMN9025A are alternate part number designations for functionally identical accessories. All three names refer to the same 2-wire earbud with clip-on PTT microphone and the same 2-pin connector. If you are ordering a replacement or confirming compatibility, any of these part numbers can be treated as equivalent.

Does the 53866 work with Motorola CLP or CLPe radios?

The Motorola CLP and CLPe series use a different connector than the standard 2-pin used by the 53866. CLP and CLPe radios require accessories specifically designed for those platforms, such as the Motorola PMLN8077 or similar CLP-specific earpieces. Confirm the accessory connector type on your specific CLP model before ordering.

Does the PTT button on the 53866 transmit on both analog and digital Motorola radios?

The PTT function on the 53866 operates electrically through the radio's standard accessory port and works with both analog and digital radios in the compatible series list. However, Motorola notes that radios with digital capability should use accessories that carry the digital symbol designation for optimized audio quality. Using a non-designated accessory on a digital radio may result in degraded audio on transmission or receive. If your DTR Series radio is operating in digital mode, check whether a digitally designated accessory is recommended for your specific model.

Related Products

• Motorola HKLN4604 — Current replacement for the 53866; swivel earpiece with in-line PTT
• Motorola CLS Series Accessories
• Motorola RDX Series Accessories
• Motorola DTR Series Accessories
• Motorola RM Series Radios
• Motorola CLS Series Radios

For additional accessory compatibility assistance, contact Tech Wholesale at 888-925-5982 or Service@TechWholesale.com. As an authorized Motorola dealer since 1997, we can confirm compatibility for your specific radio model before you order.