Card reading distance 25 meters, adjustable recognition distance and group reading performance. Multi-device compatible wireless Bluetooth Smart connection Bluetooth direct connection reads tag information, convenient for query, no interface connection required, you can set parameters Convenient for on-site debugging. Waterproof, dustproof and -proof design. The card reading distance is 0-25meters, and the output power is 0-33bBm. The greater the power, the longer the card reading distance. The actual distance is affected by the environment and the electronic tag. Specification:SG218N Network Edition SG218N: Card reading distance: 25 meters Group reading tags: 500 (The product printed words depending on the batch, but this does not affect use) Color:As Shown Material:ABS Package Contents: 1 * UHF RFID Reader 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.