Listen Technologies LK-1 ListenTALK digital transceiver

General Description

The ListenTALK LK-1 wireless transceiver is a transmitter and receiver in a compact, simple to use unit, enabling both 1-way and 2-way communication between group leaders and participants. This all-in-one device, equipped with Listen Technologies’ exclusive encryption technology and push-to-talk functionality, provides the simplest option for communication and collaboration among two or more people in any environment. In addition to the (supplied) Listen Ear Speaker, ListenTALK can be used with standard smartphone earbuds or a Listen Technologies headset.

Any ListenTALK LK-1 transceiver can be setup as a leader and there must be at least one leader per group.

A leader can be identified by a red leader clip. The leader’s unit then has additional features that ensure they are in complete control during the tour. The leader can choose for the tour participants to Listen only (they cannot interrupt the leader), Respond (they can respond back to the leader only) or Discuss (they can speak to the leader and the group).

When a unit has been setup as a leader the large silver talk button can be toggled between talk and mute. The silver talk button on participant units is programmed to PTT (Push-to-talk) and first-come-first-served with a maximum of three microphones live at any time.

Groups can be created by either pairing each unit back to back with a leader using NFC (Near Field Communication), or in batches by placing the leader unit in the red dock of an optional charging station and pressing a single button.

A wide range of accessories are available from lightweight single earphones to dual-muff noise-reduction headsets, so whether touring a quiet museum or a noisy industrial facility, ListenTALK is the perfect solution.

The new interpreter mode enables an LK-1 transceiver to listen to one channel and transmit on another. The interpreter can listen to the main presenter’s message in their headset and speak the translated words to their audience while remaining hands-free.

The ListenTALK system is ideal for many different applications including guided tours, training, event production, assistive listening and simultaneous interpretation.

ListenTALK assists in engaging your audience allowing them to fully participate and ask questions or make comments, whilst ensuring your event runs smoothly with crystal-clear, reliable and secure real-time communication.

For more information on the ListenTALK system please click here.

Features
Quick and easy setup
Two-way communication
Push-to-talk functionality
Exclusive encryption technology for added security
Compatible with standard headphones and Listen Technologies headsets
Integrated microphone (which is muted when a headset is connected).
3.5mm socket to connect (supplied) ear speaker, smartphone earbuds or a headset.
Clear OLED screen displaying the group name, antenna reception status, battery level and remaining battery life, unit ID and Leader/Participant status.
Light sensor to automatically adjust the screen brightness to preserve battery life.
USB socket for unit charging and software configuration.
Docking contacts for batch recharging and programming via a docking/recharging station.
Up to three live microphones simultaneously per group and no limited to the size.
Up to thirty groups can operate simultaneously.
Up to 150m range indoors and 300m outdoors.
Battery life of up to 8 hrs with a quick charge time of only 2.5 hrs.
Li-ion rechargeable battery or optional Alkaline battery pack.
1.9 Ghz DECT Secure and licence-free operation.
5 Year warranty.

Delivery Includes

1 LK-1 ListenTALK Transceiver
1 LA-365 Rechargeable Li-ion Battery
1 LA-401 Universal Ear Speaker
1 LPT-A207 Breakaway Lanyard

Technical Data

Physical
Dimensions (H x W x D) with Belt Clip: 10 x 5.4 x 2.4 cm
Unit Dimensions (H x W x D): 10 x 5.4 x 1.6 cm
Unit Weight: 79 g
Enclosure material: PC ABS Plastic
Colour: Black, Chrome Buttons
Indicators: Display- 64 x 128 OLED, Variable brightness, LED-RED/White multifunction (Mute, Charge Status)
User Controls: Volume up, Volume Down, Talk, Power/Status, Talk Modes, Pairing
Programming: Via software and USB port on unit or via software and USB port on Docking Station
Connections: Headset- 3.5mm TRRS, CTIA complaint, USB- Micro USB, Control and Charging, Charger- 4 Contact, Control and Charging

Audio    
Headphone Output: Speaker Load- 16 - 32 ohm load, Max Output Power- 67 mW, 16 ohm load, Threshold of Clipping, Side Tone- Adjustable
Microphone Input: Compatibility- Electret, external bias, Bias- 3 volt, 2 mA Current Maximum, Sensitivity Requirement -28 to - 50 dBV/Pa
Internal Microphone: Switching- Auto detect on jack insertion or Manual, Maximum Input Level- 109 DBSPL, Gain- Adjustable, 30 dB range
System: Frequency Response- 40 Hz to 15 kHz +/- 3dB, 22kHz low pass filter, SNR- 70 dB, A- weighted, Threshold of Clipping, THD- 0.5% @ 1kHz, 22kHz low pass enabled

Radio
Operating Frequency: 1880 to 1900 MHz
Average Power: 10 mW
Typical Range: Indoor 150 m, Outdoor 300 m, depending upon conditions
Modulation: GFSK - FHSS, TDD/TDMA/DCA
Security: Subscription- 40 bit (Pin Free), Authentication- 32 bit, Encryption- 64 bit

Power and Battery Management
Battery Type: Lithium – ion, rechargeable non-proprietary removable, 1200 mAh, Optional- 3 AAA Battery Compartment
Typical Operating Time: Li-Ion- Participant- 12 Hours, AAA – Participant Mode – 9 Hours, LI-ion – Leader Mode – 8 hours, AAA – Leader Mode – 6 hours
Typical Charge time: 2.5 - 3 Hours
Power Save Modes: Power down on loss of signal, power down on disconnection of headset (1 min), power down on charging

Environmental
Temperature: Operation- -10 °C (14 °F) to 40 °C (+104 °F)
Storage- -20 °C (-4 °F) to 50 °C (+122 °F)
Relative Humidity: 0 to 95% relative humidity, non-condensing

Compliance
Standards: Pending (FCC part 15, ICS-03, CE, RCM, RoHS, WEEE)