Designed to be the new standard for two-way mobile communications, the ListenTALK Transceiver is the smartest system available. The 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 included Listen Ear Speaker, ListenTALK can be used with standard smartphone earbuds or a Listen Technologies headset.What’s Included: One (1) LK-1 ListenTALK Transceiver w/Leader Clip One (1) LA-365 Rechargeable Li-ion Battery One (1) LA-401 Universal Ear Speaker One (1) LA-445-BK Breakaway LanyardMain Features: Fast and simple two-way communication Push-to-talk functionality Exclusive encryption technology for added security Compatible with standard earbuds and Listen Technologies headsets Long-lasting lithium ion rechargeable batteries Optional Alkaline Battery CompartmentSpecificationsPhysical: Dimensions (H x W x D) with Belt Clip: 10 x 5.4 x 2.4 cm (3.93 x 2.13 W x 0.93 in.) Unit Dimensions (H x W x D): 10 x 5.4 x 1.6 cm (3.93 x 2.13 W x 0.63 in.) Unit Weight: 79 g (2.79 oz.) Shipping Weight: 206 g (7.20 oz) with 454 g (1.0 lbs.) minimum Enclosure material: PC ABS Plastic Color: 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 StationConnections: Headset- 3.5mm TRRS, CTIA complaint USB- Micro USB, Control and Charging Charger- 4 Contact, Control and ChargingAudio:Headphone Output: Speaker Load- 16 – 32 ohm load Max Output Power- 67 mW, 16 ohm load, Threshold of Clipping Side Tone- AdjustableMicrophone Input: Compatibility- Electret, external bias Bias- 3 volt, 2 mA Current Maximum Sensitivity Requirement -28 to – 50 dBV/PaInternal 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 enabledRadio:Operating Frequency: 1920 to 1930 MHz – North America 1880 to 1900 MHz – Europe, AustraliaAverage Power: 4 mW – North America 10 mW – Europe, AustraliaTypical Range: Indoor 100 m, Outdoor 200 m, depending upon conditions – North America Indoor 150 m, Outdoor 300 m, depending upon conditions – Europe, AustraliaModulation: GFSK – FHSS TDD/TDMA/DCASecurity: Subscription- 40 bit (Pin Free) Authentication- 32 bit Encryption- 64 bit NFC Frequency (Near Field Communications): 13.56 MHzPower and Battery Management:Battery Type: Lithium ion, rechargeable non-proprietary removable, 1200 mAh Optional- 3 AAA Battery CompartmentTypical Operating Time: Li-ion- Participant- 12 Hours AAA Participant Mode 7 Hours Li-ion Leader Mode 7 hours AAA Leader Mode 4 hours Typical Charge time: 4 HoursPower Save Modes: Power down on loss of signal Power down on disconnection of headset (1 min) Power down on chargingEnvironmental: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-condensingCompliance: Standards: FCC part 15, ICS-03, CE, RCM, RoHS, WEEE