The housing is made of fine quality materials that are to wear and has a stable and reliable performance. This shortwave automatic antenna tuner can be used as both a shortwave power meter and a standingwave meter. The minimum starting tuning is 0.2W, and the maximum measurable power is 20W. It works effectively in a wide from 1.8 to 30MHz. It can be used in 20W SSB single shortwave devices. Part Name:ATU-10-0A Shortwave Automatic Antenna Tuner Size:167 x 90 x 38mm/6.57 x 3.54 x 1.50inch Charge: Type-C cable Battery: 1 * lithium battery, 3.7V, 1200mAh (included) Working frequency: 1.8-30MHz T-PER: 0.2W (min) Power: 20W(max) (The wording on the product depending on the batch, but it does not affect its use) Color:As Shown Material:aluminum alloy Package Contents: 1 * ATU-10-0A Shortwave Automatic Antenna Tuner 1 * Type-C Cable Only the above package content, other products are not included. Note: Light reflection 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.