description of goods: This is a great shortwave analyzer for ham hobbyists. With 5 buttons, Mode, Band, Config, Scan, Up, Down, you can selects operation mode, band and extended functions. It is powered by DC external power connector with 2.1mm power jack, and can test the standing wave, impedance, capacitance and so on. Features: Powered by DC external power with 2.1mm power connector(positive inner conductor), just connect the power and then work. 5 operation buttons are easy and convenient to operate. You can selects operation mode, band and extended functions. It can test the standing wave, impedance, capacitance and so on, can be connected to the computer to do antenna and other graphic analysis. Beautiful and simple designed black case would protect the antenna analyzer from external damage. This is a great shortwave antenna analyzer for ham hobbyist or professionals. Spezifikations: Test Frequency: 1 ~ 60 Mhz Push Buttons (5): Mode, Band, Config, Scan, Up, DownConnectors: Type-M USB: Mini-B USB Battery: 3.7V lithium battery(not Included) External Power: 2.1mm DC power connector, positive inner conductor(not included) Voltage: 12V - Can drive the Analyzer to work, but can not charge the battery. 13.8V ~ 18V - Can drive the Analyzer to work, also able to charge the battery. Size: 102mm*87mm*40mm / 4.01*3.42*1.57Package Includes: 1 x Analyzer(Power connector and battery are not included)