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Contact an authorized Kenwood dealer for details and complete list of all accessories and options. Model TK-7180 TK-7180H TK-8180 TK-8180H Model TK-7180 TK-7180H TK-8180 TK-8180H GENERAL RECEIVER (Measurements made per EIA/TIA-603) Frequency Range Type 1 Type 2 136-174 MHz 450-520 MHz 450-512 MHz 400-470 MHz Sensitivity (12dB SINAD) Wide Narrow 0.25 pV 0.28 pV Number of Channels* Zone Ch/GID Max. 128 per Radio Max.250 per Zones Selectivity** Wide Narrow 80 dB 70 dB 80 dB 67 dB