Version 2c · current

ChatterVOX® Model 100 (Clarus™)

Name: ChatterVOX® Model 100 (Clarus™)
Brand: ChatterVOX

Portable Voice Amplification System

The Model 100 is the original waist-worn ChatterVOX®, conceived in 1998 for a revered mentor of the developer. It earned its stripes with voice patients, and with teachers and tour guides who strain their voices when they present. It is widely considered the world’s benchmark. With its headset microphone, it boosts vocal output by as much as 15 dB. It boosts even more for esophageal speakers and electrolarynx users, with the transdermal neck microphone.

User guide (PDF) Accessories Support & discussion Where to buy

Manufacturer suggested retail price ask an approved distributor

ChatterVOX® Model 100 / Clarus™ (version 2c) in use

Section 1

What is in the box

The items in the box, numbered to match the list

ChatterVOX® Model 100 amplifier with waist band attached and four NiMH rechargeable cells installed
HM100 headset microphone (or the optional microphone you ordered)
Waist band extension
USB-C charging cable
USB-C AC/DC adapter
Nylon storage case/tote

Made for

Where it earns its place

Voice patients who want to be heard without strain
Teachers who strain their voices when they present
Tour guides, coaches and presenters, indoors
Esophageal speakers and electrolarynx users, with the transdermal neck microphone
Mealtimes, with the handheld pencil microphone and its mute switch

How the amplifier is worn — Numbered callouts match the user guide.

Quick start

Five steps to your first conversation

Charge at least 12 hours before first use. The charging port is on the bottom edge. After that, charge overnight.
Fit the waistband amplifier at the front of your waist, speaker grille facing forward.
Fit the headset over the top of your ears and around the back of your head, boom on the right. Capsule beside the corner of your mouth, flat side toward your mouth.
Insert microphone plug with the volume at OFF. Then switch on and adjust the volume to approximately the 10 to 11 o’clock position.
Back it off slightly. Listeners hear more than you do. Never point the speaker toward the microphone.

The same five steps are on the quick-start card in the box. The full user guide explains each one.

The headset microphone fitted, with the microphone beside the corner of the mouth — Microphone beside the corner of the mouth, never in front.

Speaker toward the listener, away from the microphone — Speaker toward your listener, away from your microphone: no feedback.

Controls and indicators

Every control on the top edge

Microphone jack: 3.5 mm input for any ChatterVOX® microphone. Plug the microphone in with the amplifier switched off.
Pilot light / battery indicator: GREEN LED when the amplifier is turned ON. YELLOW to RED LED indicates low battery: time to recharge.
On/Off volume control: Turn clockwise to switch on and increase the volume. Turn fully counterclockwise to switch off.
Speaker grille: Faces forward, toward your listeners. Never point it at the microphone.
Charging port: On the bottom edge. Accepts the supplied USB-C charging cable.
Charge indicator: RED indicates charging. GREEN indicates charged.

The top panel with numbered callouts — Top panel, numbers match the list.

Specifications

The numbers

Nominal gain before feedback	15 dB with headset microphone 18 dB with transdermal microphone 12 dB with collar microphone 12 dB with pencil microphone
Maximum power output	5 W at 4 ohm speaker load
Distortion	5% maximum at 2 W output
Hum and noise	50 dB minimum
Audio frequency response	100 Hz to 10 kHz, ±3 dB
Power	4 AA NiMH rechargeable cells (4.8 V); 4 AA alkaline cells (6 V) for emergency use
Operating time	More than 14 hours of continuous use per charge
Charging	Charging port on the bottom edge; USB-C cable and AC/DC adapter supplied. 14 hours first charge, then 8 to 12 hours
Microphone input	3.5 mm jack
Dimensions	8.0 in W x 2.9 in H x 2.5 in D
Weight	1.0 lb including batteries
Waist band	Adjustable to 42 in; extension included

Specifications are subject to change without notice. This page is the current specification sheet.

Manufacturer suggested retail price ask an approved distributor

Documents

Always the current version

User guide35 pages, 105 x 150 mm. Best for reading on a screen. PDF, 1.5 MB.Open PDF → Booklet for printingUS Letter with crop marks. Print double-sided at 100% scale, flip on the short edge, trim at the marks, fold and staple. PDF, 3.4 MB.Open PDF → Quick-start cardThe five first steps and three rules for clear sound, on a 4 x 6 in card. PDF, 210 KB.Open PDF →

Document CVX-100-UG-2026.10 Rev 8, October 22, 2026

Earlier versions

Looking for an earlier version? Pages for earlier versions will follow in time. Until then, contact ELT Service at (800) 286-3481 or [email protected].

Warranty and service

One year, and a person who answers

ChatterVOX® voice amplifiers and microphones are warranted against defects in materials and workmanship for one year from the date of purchase, as shown on your sales receipt. Keep your receipt. If you have a problem, contact the ELT Service Center first. Many issues are resolved in a single conversation, without shipping anything. No product is accepted for service without a Return Authorization (RA) number on the package.

ELT Service

Telephone (800) 286-3481 · Email [email protected]
Many questions are answered in one conversation, without shipping anything.

Accessories, support, where to buy

Accessories and genuine partsMicrophones, charger and cable, case and strap for this model.See accessories → Support and discussionQuick answers from the guide, and the community board.Get support → Approved distributorsBuy from an approved distributor in your region. Prices are the manufacturer suggested retail price.Where to buy →