Working Frequency: National standard (920-925MHz), American Standard (902-928MHz), Other multinational frequency standards, Label Agreement: IS018000-6C (EPC GEN2) Frequency Hopping Method: Broad spectrum frequency hopping(FHSS) or fixed frequency that can be set by software Antenna Parameters: 2dBi circular polarization antenna (built-in) Output Power: 12.5dBm-26dBm (software adjustable) Reading Distance: The maximum reading distance of the tag: 0.5m(related to factors such as transmit power, antenna type, tag type and application environment) Maximum distance to write tags: 0.2m (depending on factors such as transmit power, antenna type, tag type and application environment) Operating Mode: Active mode Passive mode Answer mode (not recommended) EXTERNAL INTERFACE Power Interface: DC+5V Communication Interface: USB virtual keyboard,USB virtual serial port Colour:Black Material:Plastic Package Contents: 1 x Reader writer(Due to different product batches, the appearance may vary but will not affect the use) 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.