Features: CGJ-100: For high-power shortwave radio stations using 5-100W. Mini short-wave automatic antenna tuner. TYPE-C charging interface, M connector. With a 0.91-inch OLED display. This antenna tuner is automatically tuned and does not require any control wires, suitable for most radio stations. Specifications: Power supply voltage: USB charge and discharge Maximum current consumption: 400ma Maximum working throughput: 100W Maximum possible measurement power: 150W Minimum power required to start tuning: 5W Minimum possible measurement power: 0.1W Measurement steps for power up to 10W: 0.1W Measurement steps for power higher than 10W: 1W Power measurement accuracy: 10% Maximum installation inductance: 8.53uH Minimum installation inductance step size: 0.05uH Maximum installation capacitance: 1869pF Minimum installation capacitance step: 10pF 4pcs panel buttons: POW, , AUTO and BOT function Display: 0.91inch OLED Note: The device does not consider its own efficiency. Supply voltage is 5V standard voltage. Material: Metal colour: black Package Contents: 1 x Automatic Antenna Tuner