[Automatic Transmit&Receive Switching]: Features automatic transmit/receive switching for more convenient operation during communication to smooth transitions without manual intervention. [Flexible Band Selection]: Supports 4-band manual or external control band switching, compatible with multiple band switching protocols, providing versatility for different radio applications. [Temperature Protecting and Intelligent Cooling]: Incorporates temperature protecting function and an intelligent cooling system to maintain the most appropriate operating temperatures, ensuring reliable performance even during prolonged use. [Rugged Housing Structure Design]: It is designed with an optimized housing structure to resist accidental and provide higher durability, ensuring long-lasting reliability in conditions. [Compact and Portable]: Features a compact design with a power output of 40-55W at 13.8V, making it suitable for portable shortwave radio setups and field operations. Name: Shortwave Power Amplifier Frequency ranges: 2MHz-30MHz Input power: 1-5W Input VSW: 2.0@50 Output power: 40-55W@13.8V Output Impedance: 50 Supplying voltage: 12-15V; 13.8V (typical) Current consumption: 12A Operating temperature: 65 Colour:Black Material:Metal Package Contents: 1 x Shortwave Power Amplifier 1 x Cable 1 x Control 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.