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Features: 1. Frequency Range: VHF/UHF136-174/400.00-480.00 MHz 2.Channel Capacity:128; Channel Spacing 25KHz 3. Battery H-1800MAh Li-ion 4. Frequency Stability: -2.5ppm-+2.5ppm 5. FM Radio Function 6. PC Program General Specifications: Frequency Range:VHF/UHF 136-174/400-520MHz RF Rated Power:5W Channel Capacity:128 Channel Spacing:25KHz Operated Voltage:7.4V Battery:1800MAh Li-ion Frequency Stability:-2.5ppm-+2.5ppm Operated Temperature:-30c-+60c Antenna Impedance: 50ohm Dimensions (LXWXH)(with battery,without antenna):110*58*32mm Weight (with battery/antenna):220g Transmitter: RF Power Output:5W Modulation:F3E Spurious Emission:65dB Inter modulation interference resistance:-65dB(W) -55dB(N) Audio Distortion:Less than 5% Transmitting Current: