Walkie Talkies Dual Band VHF UHF Two Way Radio SOS Emergency Calling with Charging Bracket AC220V UK Plug Item Type: Two Way RadioMaterial: ABSPower: 5WFrequency Range UHF: 400-520MHz VHF: 136-174MHZ Channel Capacity: 199 Channel Spacing: 25/12.5kHz/20K Battery: 4000mAh lithium battery x 1 (equipped) Battery Life (5-5-90, high power emission): About 14 Hours Current Standby: ≤45mA Current Accepts: ≤ 350 mA Current Transmits:  ≤ 1.8 A at high power and 650 mA at low power Frequency Stability: ±2.5ppm Working Temperature -30-60°C Antenna Impedance: 50Ω Transmit Output Power Mode:  High power and low power Modulation: 16K0F3E at 25KHZ, 11K0F3E at 12.5KHz Spurious Emissions -36dBm<1GHz, -30dBm>1GHz FM Signal to Noise Ratio: 45dB at 25KHz, 40dB at 12.5KHz Audio Distortion: ≤5% Modulation Limits: ±5.0KHz at 25 KHz, ±2.5KHz at 12.5KHz Adjacent Channel Power: 70dB at 25KHz, 60dB at 12.5KHz Z) Audio Response: (300-3000Hz) +1-3dB Receive Sensitivity: 0.25uV (12dB SINAD) Adjacent Channel Selectivity: ≥60dB at 25KHz, ≥55dB at 12.5KHz Intermodulation Immunity: ≥60dB at 25KHz, ≥55dB at 12.5KHz Conducted Spurious Emission: ≤-57dB at 25KHz ≤-57dB at 12.5KHz FM Signal to Noise Ratio: ≥45dB at 25KHz, ≥ 40dB at 12.5KHz The Audio Output Power: 1W at 16ohms Audio Distortion:  ≤5% Audio Response:  (300-3000Hz) +1 to -3dB