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YAPALONG 4000 Radio Unit


Type: Duplex Radio

Pack Options:
  • 4 Units
  • 3 Units
  • 2 Units
  • Single Addon Units

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The YAPALONG 4000 unit is a portable radio terminal used for creating an encrypted full duplex communication system that provides up to 300 metre line of sight range (an incredible 900 metres in some conditions). A YAPALONG 4000 radio system allows up to 8 talkers and unlimited listeners with paired YAPALONG units

The YAPALONG 4000 is extremely popular within sporting events including football, rugby and hockey

Key Features

  • 8 hour battery
  • Encrypted transmissions
  • High sound quality
  • Lightweight and compact
  • Dual bottom audio jack (2.5mm and 3.5mm)
  • Single 2.5mm port on device allows for wide range of personal mic/earpiece   preferences (32 Ohm)
  • LED Indicator
  • Mute Button
  • 8 Unit capacity for "talking" units
  • Unlimited "listening" YAPALONG units
  • Each unit supplied with Boom Microphone Earpiece
  • Dimensions - 178mm (inclusive of antenna) x 65mm (widest point) x 25mm (with clip).
  • IP54 rating

Downloads (requires a pdf reader)

YAPALONG 4000 Accessories



FIFA Style Twist Lock Headset

(inc generic adapter and x4 pairs Earportz generic ear tips)



Full Duplex Air Tube /



Push to Talk Airtube / Microphone



Large Push To Talk with Airtube / Microphone






YAPALONG Vest with pockets at front and rear



4 Unit Aluminium Case

(YAPALONG units and other equipment shown is not included)



Frequently Asked Questions

Q - In what ways is Yapalong is better than the half-duplex "walkie-talkie"?

A - Yapalong is superior in a number of ways:

1. Full Duplex - natural phone-like conversation
2. Handsfree - no push-to-talk button
3. Conference mode - not restricted to one talker at a time
4. Private and secure - no eavesdropping
5. Efficient power usage - optimized transmit power


Q - Why does Yapalong perform so well among full-duplex radios while keeping a relatively low price?

A - Most full-duplex radios are digitized. Their analog signals are converted into digital signals and transmitted in the air. So is Yapalong. Yapalong has developed such a smart technology that it can compress digital signal greatly to save digital data processing. Most full-duplex radios cannot compress data so efficiently hence the data is not processed quickly enough. Their insufficient processing capability degrades one or more of three most important features: range, sound quality, and group size. Yapalong excels in all three features while is still able to boost group size to 8 in most regions.


Q - What factors would have an impact on the range of communication?

A - Buildings, walls, metal, and conductive material has certain effect on RF(radio frequency) transmission. So is a human body which is mainly water. We can maximize range by facing the Yapalong unit to the direction of the other party. Wearing the unit on the arm with the Arm Band reduces the effect of the body blockage significantly. Signals from cellphone / mobile phone tower also affects the range. That’s why our range is 300 metres inside cities while it can reach as far as 900 metres outside towns and cities where cellphone tower signals are weak.


Q - Will adjacent Yapalong groups interfere or pair with each other?

A - No. After proper Binding Procedure, a unique group ID is generated for each group. Each unit only talks to the units within its group. Every unit identifies other unit by its serial number. Every Yapalong unit bears one unique serial number.


Q - How many Yapalong groups can be contained within one field?

A - For UK use the maximum number of Yapalong units that can be used as "talking" units is 8. An unlimited number of "listening" Yapalong units can be paired to the system.


Q - What is “No-master” in Yapalong?

A - No-master means the whole group is not affected if any unit wanders out of range or is turned off. Yapalong mesh network requires neither base station nor master unit, which makes operation flexible and connection robust. Mesh network can be considered as peer-to-peer. As long as any 2 units of the same group are within range, they are able to communicate. It won’t affect the system if any unit wanders out of range - the connection is automatically resumed if the unit comes back.


Q - Can filter filter out the noises?

A - No. It is common misunderstanding that filter can filter out the noise. Actually filter cannot tell the “good” sound from the “bad” sound, or noise. However filter can set the threshold of the sound level to be received, that is, dynamic range. On Yapalong the user can adjust microphone sensitivity to set the sound level to be received by other group users. Yapalong has enough bandwidth to allow wide dynamic range sound.


Q - How do you use Yapalong for referees in noisy stadiums?

A - For refereeing in a noisy stadium, the typical setup is as following:

The central referee sets his sensitivity to level 4 (there is total 5 levels of sensitivity in Yapalong) so both ARs (assistant referee) can hear the central referee clearly. ARs set their sensitivity level to 2 and mute their units as much as possible or use PTT (push-to-talk) headsets.


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