Brand: TWAYRDIO Model:TW-300N Newest Design HF Radio Power Amplifier for Handheld Amateur HF Two Way Radio with Cooling Fan TW-300N HF radio power amplifier has integrated TX/RX switching, an ON/OFF switch and a Mode selection switch. This particular model also includes reverse polarity protection. TW-300N HF radio power amplifier has a cooling fan above: reduce the temperature when the amplifier work a long time, or when it work bellow 20MHz. Product Description Frequency range: HF, Perform best on 20-30Mhz, 15meters, 12meters, 10meters Operate voltage 12-14 V Input current: 14-20 A Input power(FM/AM/CW):3-5 W. Input power (SSB):2-10 W Blown fuse 2x12 Different Working mode:FM-AM-CW-SSB . In FM mode: when Input 10W,Max Output power 150 W. In AM mode: when Input 10W), Max Output power 150 W In SSB mode:when Input 10W, Max output power 300 W. When input 5W, Max output power 250W (Note:Normal the output power is 70-1O0W, in FM, AM mode, the normal the output power is 120W-250W, in SSB mode. The actual output of the amplifier depends on the actual input and operation) Package Include: 1*TW-300N HF Radio Amplifier if there is any problem or any doubt the amplifier, please email us first before you leave a negative review/feedback, we promise we will try our best to solve the problem for you and we will be very appreciate it if you would like to give us a opportunity to help you. thank you.