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.