Purpose: This product is only used for receiving short wave broadcasting. If there is a professional antenna, it can receive HAM communication. Stable: NE602 mixing chip is adopted, with stable performance. Equipped with: with connecting wire to the stability of connection. Simple operation: easy to use and operate. : Made of high-quality materials, it is and has a long service life. Product name: RTL-SDR HF up converter Material: metal Color: Black Receiving frequency: 150K-30MHZ Working voltage: 5V Power: 1.6W Local oscillator: 125MHZ, which is very important. It needs to be set in the software or+125M in frequency. For example, 7.05M is 123.05M (7.05+125) Mixing chip: NE602 explain: 1. According to the circuit design and modification in the online radio discussion 2. As long as it is used to receive short wave broadcasting, if there is a professional antenna, it can receive HAM communication 3. Provide SDR # software Package Contents: 2 x RTL-SDR up converter 2 x USB cable 2 x Connecting line 2 x SMA male to female 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.