A total of 4 frequencies are supported: IC 13.56Mhz, ID 125Khz / 250Khz / 375Khz Due to different batches, there may be differences in product appearance, color, and printed text, which will not affect the use. Colour:As Shown Material:Plastic Package Contents: 1 x RFID Reader 2 x Adapter(The color and appearance are random, and the designation is not accepted) 1 x USB Cable(The color is random, and the designation is not accepted) 3 x CUID Keychain (The color and appearance are random, and the designation is not accepted) 3 x UID Card 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.