Ecome ET-650S 2 km range output two ways radio 2pcs walkie talkie

Ecome ET-650S 2 km range output two ways radio 2pcs walkie talkie  Product Description           Functions FM radio Low battery warning Channel scan Time-out timer(TOT) Voice Operated Transmitting(VOX) Power saving function QT/DQT Write frequency encryption Alarm function CTCSS/DCS     Genneral Type High-power handheld radio Frequency Range UHF: 400-480MHz Memory Channel 16 Demission 145*60*55mm Battery Capacity 4000mAh lithium Transmission Part Output power 5W/10W/25W Maximum Fequency Offset ≤5KHz FM Noise ≤-45dB Modulation Distortion ≤5% Reception Part Sensitivity ±2.5ppm Audio Power 0.4W Audio Distortion