Features: To clone 125Khz RFID cards. Supports 125Khz EM4100HID/AWID. Copies EM4100/HID/AWID Ability to reference the device module when working. Easy to use. Supports HID copying. Description: 2 buttons for simple operations Built-in transmitter/receiver antenna. Read/writable cards and key fobs can be cloned and copied > 20,000 times with different IDs. Specification: Working frequency: 125Khz Power: Two AAA batteries, can be used 20,000 times. (Batteries not included) Distance: 25 mm (key fob), 60 mm (card) Supported blank tags: T5557, EM4305, CET5200, T557. Dimensions: 110*67*30 mm Buttons: Read button, Write button Package includes: 1 x Handheld RFID writer 10 x Tags 1 x Instructions Note! Press the power switch on the right of the device, hold it down two or three times, and the LED light will turn on, meaning it is working. If it doesn't start up, try again. Repeat step 3 or step 4 if you want to create more cards with the same ID. Thank you