[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 drops and provide higher durability, ensuring long-lasting reliability in various 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:less than equal 2.0@50OHM Output power:40-55W@13.8V Output Impedance:50Ohm Supplying voltage:12-15V; 13.8V (typical) Current consumption:less than equal 12A Operating temperature:less than equal 65℃ Item size:197x90x39mm/7.76x3.54x1.54in Item weight:552g/1.22lb Colour:Black Material:Aluminum Alloy Package Contents: 1 * Shortwave Power Amplifier 1 * Cable 1 * 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.