BJ-E66is a Professional VHF/UHFInterphone,Portable Two Way Radio,Walkie-Talkie. The Functions as follow: Frequency range:136-174MHz, 400-470MHz 1. 16Memory Frequency Channels 2. Time-out Timer 3. Setting QT and DQT 4. Monitor 5. Setting Battery Save Function 6. Low Battery Warning 7. Voice prompt(English/Chinese) GeneralSpecificationsFrequencyRangeVHF136-174MHz230-260MHzUHF350-390MHz400-470MHz450-512MHzMemoryChannels16ChannelSpacing25/12.5KHzWorkingModeCo-channelsordis-channelssimplexVoltageDC7.2VBatteryV3001100mAhLi-ionV200650mAhNiCdAveragebatterylife(at5/5/90dutycyclewithbatterysaver)1100mAhLi-ionAbout15hrs650mAhNiCdAbout12hrsFrequencyStability±2.5ppmOperatingTemperature-20/+50AntennaImpedance50ΩDimensions(HxWxD)(mm)(W/Battery,W/oAntenna)100mm×55mm×32mmWeightabout194gV200about200gV300TransmitterPowerOutputV3005W/V2002WMaximumDeviation≤5KHzAudioDistortion≤3%ModulationCharacteristic3dB3dBAdjacentChannelPower≥65dBSpuriousRadiation≤7.5μWOccupiedBandwidth≤16KHzS/N40/34dBReceiverRFSensitivity0.2μVAudioDistortion≤3%AudioResponse2dB10dBAdjacentChannelSelectivity≥60dBIntermodulationRejection≥60dBSpuriousResponse≥60dBBlockCharacteristic≥85dBS/N40/34dB