... 400-480MHz,465-520MHzChannel Capacity128 channelsChannel Spacing25KHz(Wide Band) 20KHz(Middle Band) 12.5KHz(Narrow band)Phase-locked Step5KHz,6.25KHzOperating Voltage7.4 ... V DCBattery LifeMore than 12 Hours (1200mAh),Frequency Stability±2.5ppmOperating Temperature ... ) Channel step 5k, 10k, 6.25k, 12.5k, 25k23)Program radio channel name