Constant Able™ PTT – Kenwood K1 (2-Pin)

The Most Capable, Broadly Compatible Push-to-Talk for Two-Way Radios on the Market

Developed in collaboration with tactical law enforcement teams—including SRT and SWAT operators—and shaped by the insight and lessons learned as communicators in combat, Constant Able was purpose-built to tackle the toughest interoperability and interference challenges in the field.

Push-to-talks aren’t an accessory—they’re the core of what we do. Constant Able delivers unmatched compatibility, rugged simplicity, and bulletproof performance in the field. From headset to radio, it just works.

Constant Able automatically detects PELTOR or NATO-style wiring and supports both high and low impedance microphones, including electret and dynamic (150 ohm) variants—no switches, no setup, no reprogramming. It has been field-proven with a wide range of professional communications gear including PELTOR COMTAC II–VIII, XPI, Ops-Core AMP, TCI/Safariland, MSA Sordin, aviation-style headsets, as well as discreet earpieces like the N•Ear 360 Flexo and Invisio M3.

COMPATIBLE WITH HEADSET AND EARPIECE PLUGS:

• U-174/U (NATO J11)
• U-384 (DUAL COMM SPLIT AUDIO*)

Broad compatibility with tactical headsets, earpieces, and accessories using any combination of plug type, wiring convention, and microphone impedance described above. Yes even the ones you got from Amazon. 

HOW DOES IT WORK?

Attach the Constant Able PTT to your compatible radio. Plug your headset or earpiece into the headset port using a supported connector (U-174/U or U-384 via adapter). When you press the button on the Constant Able—protected inside an integrated hot mic shroud—your radio transmits. You speak and listen through your headset with clean, reliable audio.

Whether you’re switching gear mid-mission or managing a mixed headset inventory, Constant Able auto-configures in real time—automatically and instantly.

RADIO INTERFACE: KENWOOD K1 (2-PIN) CONNECTOR

Engineered for plug-and-play integration with a massive range of commercial and amateur handheld radios, the Kenwood K1 variant of Constant Able is a standout option for entry-level users, ham operators, and professionals alike.

Support for VCC (accessory power) and non-VCC configurations, Constant Able works reliably with radios like the Baofeng UV5R and others whether or not accessory power is present—a novel feature designed specifically for the unique challenges of our radio community.

Compatible Radios:

Kenwood: NX-230, NX-240, PMR-446, TH-D7AG, TH-D72A, TH-F6A, TH-F7E, TH-G71A, TH-K20A, TK220, TK240, TK260, TK270, TK372G, TK3173, TK5210, TK5400, TK5410, TK-3400, TK-3501E, TK-3501T
Ailunce: HD1, HA1G GMRS
BaoFeng: UV5R, UV-3R+, UV-5RE, BF-888S, BF-F8, UV-B6, UV-B5, UV-3R, UV-5RA, UV-5RC, BF-A5, and similar models
Hytera: TC-265, TC-268, TC-270, TC-620, TC-700EX, X01
Retevis: RT1, RT2, RT3, RT5, RT5R, RT7, RT8, RT21, RT22, RT23, RT24, RT25, RT27, RT80, RT81, H777
Wouxun: KG659, KG-UV6D, KG-UV8D, KG-UV950P, KG-UV920P, KG-UV6D (PRO), KG-818, KG-829, KG-889, KG-UVA1
Others: Olympia P324R, Eartec MC-1000, QuanSheng TG series, WEIERWEI VEV-3288S, Black Diamond Radio, LINTON LT series, Uniform Warehouse UA series, and more.

Note:

Compatibility Notice: This product is not compatible with Baofeng UV-82 or UV-82HP models. These radios use a non-standard K1 pinout and may result in improper operation.

DESIGNED FOR MISSION-FIRST COMMUNICATION

• Zero batteries to charge or replace
• Designed to resist interference from modern public safety and amateur digital waveforms
• IP67-rated sealed housing – waterproof and dustproof
• Crisp, glove-friendly button on the Constant Able PTT, protected by an integrated hot mic shroud
• Rotating clothing clip for ambidextrous mounting
• Made in the USA — designed, developed, and manufactured by DISCO32
• Backed by a 1-year warranty

Whether you’re operating in tactical, public safety, amateur radio, or professional security environments, the Constant Able K1 (2-Pin) delivers what others don’t: real-world headset flexibility and reliable, seamless radio integration—with no compromises.

Need help with radio or headset compatibility?

Visit our Radio Interface Guide for step-by-step setup and support.

*Audio will be treated as monobinural by the headset when using the TP-106 adapter.

*Not compatible with DISCUS inline.