Brand:Motorola Model:C51 UHF(400-470MHz) Super Receiving VOX TOT Monitoring Keyboard Lockout Busy Channel Lockout High-Low Power Battery Power Saving Low Battery Warning Scrambling Function Companding Function Special Signaling Chinese/English Voice Prompt Programming Encryption Function 50 CTCSS/208 DCS. Specification: Frequency Range:400-470MHz Supply Power:DC3.7V Memory Channel:16 Theoretical Communication Distance:1-10km Frequency Stability:±2.5ppm Antenna Configuration:Internal Antenna Ground Method:Cathode Work Mode:Co/Differ-frequency, Simplex Communication Charging Method:USB Battery Capacity:6800mAh Communication Type:no card can be inserted Working Temperature:-20 degrees to 40 degrees Standby Time:10 days Dimension:136*59*21mm Weight:125g Warranty:6 months Reciever: Sensitivity:<0.16μV (12dB SINAD) Audio Power:≥300mW Audio Distortion:<5% Intermodulation Interference Resistance:≥ 60dB Receiving Current:≤300mA Standby Current:≤20mA Transmitter: Output Power:≤5W Modulation Mode:FM(F3E) Max Frequency Deviation:≤±5KHz Sparius Radiation:≤7.5μW Phreemphasis Character:Pre Octave 6dB Emission Current:≤1000mA Standard Package includes: 2 x Mini Radio Motorola C51 2 x Li-ion battery pack 2 x Charger 2 x Belt clip 1 x User's manual