Redell (R-8208) 16 Channel Walkie Talkie - Twin Pack - Black - Frequency Range 136-174/400-470MHz-Channel Capacity 16 channels-Output Power 5W - Battery Life 1000-1500mAh (More than 12 Hours) - Functions monitor/scan/scan temperary delete/high-low power selectable/Talk reverse frequency/busy channel lockout / squelch adjustable/ key programmable/emergency call/battery call /battery save/end roger Transmitter (ETSI EN 300 086 standard testing ) - Frequency Stability 2.5ppm Modulation Limiting 2.5KHz - Audio Distortion 3% Audio Response (+3dB~-3dB) -Adjacent Channel Power 65dB -Spurious Radiation 7.5uW -Occupied Bandwidth 16KHz- Channel Spacing 25KHz(Wide Band) 20KHz(Middle Band) - 12.5KHz(Narrow band) - Phase-locked Step 5KHz,6.25KHz - 216g