Constant Able™ PTT – Motorola M5 / EF3 Connector
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:
Broad compatibility with tactical headsets, earpieces, and accessories using any combination of plug type, wiring convention, and microphone impedance described above.
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: MOTOROLA M5 / EF JOHNSON EF3 CONNECTOR
Engineered for direct integration with:
Motorola M5 Compatible Radios:
- GP1200, GP900, GP9000, HT1000, JEDI, JT1000, MT1000, MT1500, MT2000, MTS2000, MTX8000, MTX838, MTX900, MTX9000, MTX90, MTX-LS
- PR1500, PM1500, XTS1500, XTS2000, XTS2250, XTS2500, XTS3000, XTS3000 Astro, XTS3500, XTS4250, XTS5000, XTX2500
EF Johnson EF3 Compatible Radios:
- 51 Fire ES, 51LT ES, 51SL, 511X, 512X, 514X, 515ES, 515L, 518X, 51SLES Series
- 5000 Series, 5100 ES Series, 7700 Series, Ascend 5100, Ascend ES
- AN/PRC-127EF Series, Avenger 8100 Series, Multi-net Ascend ES Series
- Viking VP300, VP400, VP600, VP900, Viking Fire, Viking CK8500 Series
Kenwood Viking Compatible Radios:
Not compatible with DISCUS. DISCUS is designed exclusively for dynamic microphones. Constant Able supports electret and amplified systems with full automatic switching.
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, or professional security environments, the Constant Able M5 / EF3 Connector delivers what others don’t: real-world headset flexibility and reliable, seamless radio integration—with no compromises.
