1. Made of high-quality materials, it is and has a long service life. 2. Small size, light weight, and easy to operate. 3. Fine workmanship and excellent performance 4. Support RTL-SDR long antenna connected to BNC connector 9:1 impedance transformer (BALUN). 5. Easy to access and set up QRP stations for outdoor use. Model: RTL-SDR Usage frequency: 100K-50MHz Size: approximately 56 x 58 x 28 mm/2.2 x 2.3 x 1.1 inches The package includes: 100K-50MHz RTL-SDR Impedance Transformer Color: Gray Material: plastic Package Contents: 1 * Converter 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.