Working Mode: Half Duplex (Cannot receive and transmit at the same time). Cooling Way: Cooling fan works when the temperature is more than 40 degree. Size: 130 x 104 x 60mm (LWH). 1 x RF Power Amplifier. This item is in the category "Consumer Electronics\Radio Communication\Ham, Amateur Radio\Ham Radio Amplifiers".The seller is "csdf5963" and is located in this country: CN. This item can be shipped worldwide.