Outerloop 3.5

Universal Intercom Belt Pack
JK Audio Outerloop 3.5 Front

A Universal Intercom Belt Pack for your Wireless Device.

Outerloop 3.5™ provides a wireless link to your intercom system. This universal belt pack provides XLR connections for your existing 4-pin or 5-pin intercom headset, routing audio through a wired connection to your mobile device. Use your mobile device to call into your intercom phone bridge, station phone coupler, or any phone-based intercom app such as Unity Intercom or Clear-Com® Agent-IC.

Learn More Details Specs

Product Details

HD Voice Compatible (7 kHz Wide-Band Speech)
Connects to Phones and Notebooks with 4-conductor 3.5mm Headset Interface
4-pin and 5-pin Male or Female Headset Jacks
Send and Receive Volume Controls
Push-On, Push-Off Talk Button
Recessed Sidetone Level control
20 hours on one 9 Volt Battery
Made in America
Approved for Sale in Europe and Australia

Wired to a Wireless Network

Outerloop 3.5 includes a cable that plugs into the 3.5 mm TRRS headset/earbud jack of your mobile device, providing two-way communications. Separate Send and Receive level controls, a push-on, push-off Talk button, as well as a recessed sidetone level control let you adapt to any situation whether you are around the corner or around the world.


Adapting to the mixed-up intercom world, model OTL3.5-F features both 4-pin and 5-pin Female XLR headset jacks, while model OTL3.5-M features both 4-pin and 5-pin Male XLR headset jacks.

JK Audio Outerloop-3-5-F Back
JK Audio Outerloop-3-5-M Back


Model Outerloop 3.5-F
Headset 4-pin Female XLR, 5-pin Female XLR
Model Outerloop 3.5-M
Headset 4-pin Male XLR, 5-pin Male XLR
Headset Microphone
Impedance 50-2000 ohms
Headset Earpiece
Load Impedance 50-600 ohms
Power >50 mW into 150 ohms
Frequency Response 50Hz - 15 kHz
Power >20 hours on one 9 VDC Battery
Size 4.7” x 3.75” x 1.65” (12 x 9.5 x 4.2 cm)
Weight 10 oz (275 g)
*HD Voice: While standard phone calls have a narrow bandwidth of 300 Hz to 3.4 kHz, HD Voice calls offer 50 Hz to 7 kHz bandwidth. The additional 1.5 octaves on the low end gives voice a more natural sound, while the additional upper octave dramatically improves speech clarity and intelligibility.

*Wireless HD Calls: To take advantage of this extended bandwidth, both phones on the call must support HD Voice, and both phones must be on the same carrier, in coverage areas that support HD Voice.