Kenwood TK-3402U16P ProTalk 5 Watt Two-way Radio, UHF, 16 Channels, Black Color 16 Total channels, More or less 300000 square feet/30 floor/7 mile range, and 5.0 Watt output power for maximum mmovility Includes drop-in fast battery charger; Low battery alert; Battery saver; Rechargeable lithium-ion 2000 mAh battery pack included for uninterrupted workflow Radios have 90 Pre-set frequencies (451-470 MHz); 16 Channels at 12.5 kHz Channel spacing to avoid signal mixing Water/dust resistant, Operating temperature range -22 degrees F to +140 degrees F(-30 degrees C to +60 degrees C); Frequency stability more or less 2.5 ppm(-30 degrees C to +60 degrees C); 50 Ohms antenna impedance; For all-weather reliability experience