How to Choose a Translation System by Group Size (5 to 50+ People)

Group size determines the overall configuration of the translation system, including the number of receivers, transmitter types, channel requirements, battery management solutions, and room for future expansion.

The Five Questions That Actually Size Your System

Question	Why it changes the answer
How many listeners at peak?	Sets the receiver count. Always size to your busiest day, not your average day.
How many languages at once?	Each language needs its own channel — and usually its own interpreter.
Is the venue fixed, or do people move?	Fixed rooms suit table-top transmitters. Walking tours and factory floors need handheld, battery-powered units.
Do you have an interpreter?	With an interpreter, choose a simultaneous interpretation system. Without one, choose an AI translation device.
How far do listeners spread out?	Range requirements from 80 m to 250 m narrow the technology choice quickly.

Quick Match: Group Size to Recommended System

Audience size	Typical setting	Recommended Models	AI Translation Recommendations
5–10 people	Small bilingual meeting, private tour, one-to-one plant visit	TT117 + TT118 FM TT106S or T130P	TT136 AI translation kit
10–20 people	Church service, classroom, small conference room	TT106S , T130P TT117 + TT118 FM
10–30 people	Walking tour, multi-site church, community event	TT106S, T130P TT117 + TT118 FM
20–50 people	Mid-size conference, court hearing, growing congregation	T130T + T131T TT118 + TT119 TT117 + TT118 FM
50–200 people	Large conference, convention, multi-language summit	T130T T131T

5–10 People: The Starter Tier

At this size the temptation is to improvise — a phone speaker, a free translation app, someone repeating the sentence. It works until it doesn't: the room gets noisy, the terminology gets technical, or the visitor is a paying client and improvisation starts to look unprofessional.

There are two realistic options:

No interpreter available — TT136. The speaker talks naturally and listeners hear their own language through earhook receivers. It covers 120+ languages, reaches 200 m, requires no app for the listener, and bills by the second so you pay only for translation you actually use.
A volunteer or staff interpreter is available — an entry TT117 + TT118 FM kit from $299.99, with 6 channels and 80 m of range.

Sizing tip: buy two spare receivers. At this tier, one failed unit removes 10–20% of your capacity.

10–20 People: Churches, Classrooms and Small Conferences

This is the most searched size band and the easiest to get wrong, because it sits exactly between 'a portable kit will do' and 'we need a proper installation'.

T130T + T131T is built for it: UHF transmission, up to 250 m of range, 7–12 channels, DSP noise reduction, a table-top transmitter powered from DC 5V with lithium-battery receivers, and an interpreter monitor.

The interpreter monitor matters most at this size. It lets the interpreter select an external incoming audio source and use a headset microphone to listen to the floor language — without needing a separate interpreter console or external headphone amplifier. Volume control sets the incoming level, and a mute button handles the coughs and pauses every live session produces.

Sizing tip: if the room is fixed and you have mains power, table-top wins. If you move between rooms, choose a handheld model instead — a table-top transmitter stays behind.

20–30 People: The Mobile Tier

Once people are standing up and moving, the specification that matters is no longer range or channel count. It is whether the transmitter can travel. Four Retekess systems compete here:

Model	Channels	Range	Tech	Why choose it
T130P + T131P	7	160 m	195–216 MHz	Fully mobile with intelligent noise reduction — the quality choice for walking groups.
TT117 + TT118	6	80 m	72–76 MHz FM	The budget-conscious option for meetings, churches, schools and community events.
TT106S	3	200 m	2.4–2.485 GHz	An extremely lightweight ear-hook receiver — the pick when the receiver must be almost unnoticeable.

Sizing tip: mobile groups lose people around corners. Buy roughly 10% more receivers than headcount.

50+ People: Conference Scale

At conference scale the constraint stops being the audience and becomes the language plan. TT118 + TT119 handles it with a table-top FM transmitter, 6 channels, 120 m of range, AC power and an interpreter monitor — and critically, it transmits to an unlimited number of receivers.

That means you add receivers as attendance grows and never replace the transmitter. A 50-person event this year and a 150-person event next year are the same purchase plus more receivers.

One exception: a walking group of 50 — a bus tour, a festival site, a plant walkthrough — should use a high-count handheld kit or TT136 instead, because a fixed 120 m transmitter does not follow a moving crowd.

50+ People: Conference Scale

At conference scale, the constraint stops being the audience and becomes the language plan. The Retekess T130T + T131T handles it with a table-top UHF transmitter, 7–12 channels, 250 m of range, DC 5V power and an interpreter monitor — and critically, it transmits to an unlimited number of receivers.

That means you add receivers as attendance grows and never replace the transmitter. A 50-person event this year and a 150-person event next year are the same purchase plus more receivers.

One exception: a walking group of 50 — a bus tour, a festival site, a plant walkthrough — should use a high-count handheld kit or TT136 instead, because a fixed-position setup does not follow a moving crowd.

When There Is No Interpreter at Any Size

TT136 removes the interpreter variable entirely, which changes how you size. The workflow is four steps:

Connect to Wi-Fi or a mobile hotspot.
Select translation mode and set the source and target languages.
Speak naturally into the TT136 transmitter.
Listeners hear the translation through their earhook receivers.

It covers 120+ languages, reaches 200 m over FHSS 2.4G, and uses pay-as-you-go billing with transparent records of usage, costs and remaining credits — 100 hours of translation credits are included with purchase. Whether you are running a 5-person factory walkthrough or a 50-person city tour, the variable becomes receiver count, not language capability.

Full Specification Comparison

Model	Group size	Channels	Range	Tech	Interpreter monitor	Transmitter	Power	Price	Best for
TT117 + TT118	10–30	6	80 m	72–76 MHz FM	No	Handheld	Replaceable AA	$299.99–$799.99	Budget-conscious small-to-medium meetings, churches, schools, community events
TT118 + TT119	20–200	6	120 m	72–76 MHz FM	Yes	Table-top	AC transmitter, battery receivers	$569.99–$4,099.99	Fixed-venue large conferences, churches, courtrooms, seminars
T130T + T131T	10–20	7–12	250 m	UHF	Yes	Table-top	DC 5V transmitter, lithium receivers	$499.99–$799.99	Fixed-venue meetings, large conferences, churches, courtrooms
T130P + T131P	10–30	7	160 m	195–216 MHz	No	Handheld	Lithium	$389.99–$1,199.99	Fully mobile multi-site events, churches, schools, community events
TT116	10–30	4–8	200 m	UHF	No	Handheld	Replaceable BL-5C	$309.99–$865.99	Extended runtime; churches, schools, community events
TT106S	10–30	3	200 m	2.4–2.485 GHz	No	Handheld	Lithium	$289.99–$999.99	Where an extremely lightweight receiver is needed
TT136	Any (by receiver count)	120+ languages	200 m	FHSS 2.4G	No interpreter needed	Handheld	Lithium	From $549.99	No-interpreter international factory tours, multilingual tours, schools, business receptions

FAQ

How many receivers do I need for a 20-person group?

Twenty, plus two spares. The transmitter is never the limit — a single transmitter serves an unlimited number of receivers.

Can one system serve a 10-person weekday class and a 50-person Sunday service?

Yes. Buy receivers for fifty and choose a transmitter with channel headroom. The same hardware covers both.

Do I need one transmitter per language?

Yes. Interpreters need a transmitter to broadcast their translations, with each language assigned to a dedicated channel. Each channel requires an interpreter—unless you are using the TT136, a device that supports simultaneous output for two languages.

What is the cheapest way to start?

TT106S from $289.99 if you have an interpreter, or TT136 from $549.99 if you do not. Both are handheld.