Note: Our product has limited applicability and cannot read all types of RFID cards. Built-in buzzer and LED. Reading distance is 0-6 cm (0-2.4 inches). Compatible with 125 kHz RFID cards. Supports EM4100 ID cards, 5200 cards, AWID cards, EM4305 cards, T5577 cards, and some types of HID cards. Not compatible with 13.56 MHz IC cards, UHF cards, UID cards, HID iCLASS, HID ProxCard II, or HID ProxKey III. Handheld design, comfortable to hold. Operates on 2 AAA batteries (batteries not included). Easy to use and carry. Widely used in homes, communities, schools, offices, hotels, elevators, and other locations requiring security monitoring or access control. Color: Blue. Material: Plastic. Package contents: 1 x RFID ID Writer, 10 x EM4305 Writable Card. Only the items listed are included. Note: Lighting and display differences may cause slight color variations between the image and the actual item. Measurement error allowance is +/- 1-3 cm.