HYS TC-300N HF Transceiver HF Power Amplifier Handheld Amateur CB Radio HF Amplifier best effect Frequency range:20-30mhz.( Works on 15 meter, 12 meter and 10 meter) HF amplifier bellow 20Mhz the output power will be lower and vswr will be higher than 20-30Mhz.Connection of antenna is very important for low frequency product , the effect of the antenna will seriously affect HF amplifier effect. MINI FUN FUNICATION: "High Rotaion Spead" Fan is designed for a better heat dissipation funication. Operate voltage 13.8Vcc.Input current/POWER:14-20 A. Input power(FM/AM/CW):3-5 W Input power (SSB):2-10 W.Compact high power all mode amplifier with automatic TX/Rx switch and On/Off switch. The amplifier different model ,such as FM,AM,SSB,CW.Please learn about how to operate when you want to purcahse.Or ask for us and give professional advice.