Features: USB cable connection to PC, plug and play. Compact design, Waterproof Material, Easy Usage. Equipped with diagnostic power LED, Built in operating buzzer. Charged with USB, does not require any external power supply. Can read all 125Khz RFID EM4100 Card/Tag. Specifications: Material: Plastic Color: Black Size: Approx. 10 x 7 x 1cm/3.9 x 2.8 x 0.4in Interface: USB,106 kbit/s Source Voltage: DC 5V (+/-5%) Operating Frequency: 125KHZ Read/Write Distance: 5-8cm Operating Temperature: -10~70°C Supported OS: for Windows 2000, 2003, XP,Windows7/8/10, etc. Package Weight: Approx. 100g/3.5oz Package List: 1 x RFID Card Reader 1 x USB Cable 1 x Driver CD Note: 1. Please allow 1-3cm error due to manual measurement. Thanks for your understanding. 2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard. .