10pcs 125khz Rewritable Keyfobs T5577 Rfid Access Control Tags Keychain Cloner. Introducing Our Versatile and Efficient Rewritable 125KHz T5577 Keyfobs, Designed to Enhance Your Access Control Systems. These Keyfobs Feature a Rewritable T5577 Chip, Allowing You to Update Access Information As Needed, Providing a Flexible and Cost-effective Option. Each Fob Includes a Duplicate, Ensuring You Always Have a Backup on Hand. The Keyfobs Operate at a 125KHz Frequency, Ensuring Quick and Reliable Communication with Compatible Devices. Perfect for Both Small Businesses and Personal Use, These Keyfobs Allow You to Effortlessly Clone Access Cards with Their Proximity Copy Function, Eliminating the Need for Complex and Costly Equipment. - Material: Durable Plastic - Size: 3.5 X 2.9 X 0.5 Cm - Frequency: 125KHz - Chip: T5577/EM4305, Compatible with EM4305/EM5200 - Detection Distance: 0-5 Cm - Water Resistant - Includes Key Ring - Compatible with 125KHz RFID Readers - No External Power Required Ensure Your Access Control Systems Are Up-to-date and Secure with These Easily Rewritable and Cloneable Keyfobs..