Mini short wave automatic antenna tuner, type-c charging interface, m seat, oled display.     The antenna tuner is tuned automatically without any control wires, suitable for most radio stations.     The device contains a set of 7 capacitors and 7 inductors, which allows it (with the largest configuration) to work effectively over a wide frequency range, overlapping the 1.8-55mhz amateur radio band.     With metal housing, stable and reliable performance.     Supply voltage: USB charge and discharge (built-in battery)     Battery: 1 * lithium battery, 1350mAh (included)     Maximum current consumption: 1350mAh     Maximum working     power : 100w Maximum possible measuring     power : 150w Minimum power required to start tuning : 5w     Minimum possible measuring power: 0.1w     Measuring steps for power up to 10w: 0.1w     Measuring steps with power greater than 10w: 1w     Power measuring accuracy: 10%     Maximum installation inductance: 8.53uh     Minimum step length installation inductance: 0.05uh     maximum installation capacity: 1869pf     minimum step length of installation capacity: 10pf     Display: OLED     Material:metal     colour:black     Package Contents:     1 x Automatic Antenna Tuner     Only the above package content, other products are not included.     Note: Light shooting 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.