we manufacture many kinds of handheld interphone,supply durable products andoffer best price, deliver prompt Detailed Description Features:199 Stored Channels CTCSS\ DCS Function PC Programmable Wire Copy Function channel scan emergency alarm functionTechnical Specifications:General Frequency range136-174MHz \ 400-470MHzFrequency CircuitPLL CircuitOperating ModeF3EOperation modeSimplex of co-frequency or alien frequencyOperating temperature range-30 to +60Rated VoltageDC 7.2V±15%Antenna impedance50AOperation Distance3-15kmSize101×54×36mm(no including antenna)Weight 220g(including battery)TransmitterRF power output5WFrequency Stability±2.5ppmMaximum Frequency offset≤5KHzRadiation≤-60dBModulation Distortion5%(300Hz-3KHz)Transmitting current≤1100mAReceiverCircuitryDouble Super HeterodyneIntermediate Freq.1st IF38.850MHz2nd IF450KHzReference sensitivity0.15uV(12dB SINDA)Squelch sensitivity0.12uVSquelchprogramableAudio power≥500mWReceiving current100mASquelch waiting current20mA