Main technical parameters Working frequency: 125KHz Applicable cards: iButton card, 125KHz card Card reading time: 0.2s Induction distance: 0cm Indicator light: 2 LED(red/white) hwj huam: Any standard USB Port or via USB/220V adapter, or from 2×CR2020 batteries Working Temperature: -20ºC~+65ºC Material: Plastic (dej waterproof, but not suitable for hard environmental conditions) Plastic casing color: brown Size: 100×33×10mm