Working frequency: 920-925mhz or 865-868mhz Antenna: built in circularly polarized antenna RF power adjustment range:0-20dbm software adjustable Protocol standard: ISO18000-6C (EPC G2), 6B Interface: USB-HID(Plug and Play)/USB Virtual COM (Output Adjustable) Working temperature: -20°C-60°C Storage temperature: -40°C-70°C Working humidity: 20%-90% Read card distance: 0-30cm (with the reader configuration and tag performance related) Working status: buzzer and logo light indicator Power consumption: Less than 2w Power supply: USB power supply Colour:As Shown Material:Plastic Package Contents: 2 x UHF Reader/Writer 2 x USB Cable 2 x UHF tag for test 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.