A must-go for radio enthusiasts. Low-impedance headphones are fine. No headphones are provided. Bring your own headphones! The key to the success of a crystal radio is to be to connect a very long antenna (preferably over 10 meters) and a good ground wire! This radio already has an impedance matching transformer, so you can use low-impedance headphones. The reception conditions in different places are also different. If you have the ability to , you can change the number of turns of the magnetic bar coil to receive more radio stations in a range. Attention,!1.Not all stations are available at all times, and the radio station may not be turned on. 2.Not all places can receive stations! Some places may have bad radio wave environments, so stations cannot be received. Due to different batches, there may be differences in product appearance and printed text, which not affect use Color: As Shown Material: PCB Package Contents: 1 x Crystal Radio 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.