1. Versatile Band Switching: This portable shortwave power amplifier supports 4 manual or external control line band switching options for easy frequency adjustments. 2. Automatic TX RX Switching: Built in circuitry enables seamless transmission and reception switching without the need for a dedicated PTT line. 3. Temperature Safety and Intelligent Cooling: Aluminum alloy casing with powerful fan ensures efficient heat dissipation and automatic cooling at set temperature thresholds for the power amplifier. 4. Compatibility with for and for Band Switching Protocols: Portable power amplifier features seamlessly switch between for and for bands with a frequency range of 2MHz‑30MHz. 5. High Transmission Power Range: Transmit up to 6W of power, making it ideal for a wide range of portable shortwave amplification needs. Item Type: Portable Power Amplifier Frequency Range: 2MHz-30MHz Input Power: 3-6W Input VSWR: ≤2.0 at 50Ω Output Power: 80-120W at 13.8V Output Impedance: 50Ω Supply Voltage: 12-15V; 13.8V (typical) Current Consumption: ≤18A Operating Temperature: ≤65℃ Colour:Black Material:Aluminum Alloy Due to different batches, there may be differences in product appearance and printed text, which not affect use Package Contents: 1 * Shortwave Amplifier 2 * Cable Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.