Dear buyer, Welcome to my shop, if you have any question please let me know, I will do my best to help you when received your mail(will reply within 48hours), thanks for your understand,if want many quantity or many items total please contact me,maybe will have a good price,Have a nice day! This is Writable/Rewritable proximity RFID glass tags not same as common RFID card/token,because this card/tag not only read and can be writeable), it can write or clone the fob/card number you want. need you have EM4100 copier or writer,can write it to EM4100,if you have special HID writer/copier can be write it to HID type too,so it can change to different type,125KHz EM4100 or 125KHz HID,need you have that type copier or writer,please note,because this glass tag very small,the EM4100/HID writer/copier or other reader must have strong antenna(sensor strong),so easy to read or write success,before I send I will check all the tags working good before send,but we are sure your read/write device will match good with this glass,this 2pcs/lot is bid for test,thank you so much for kind understand. Specifications: This is the 125KHZ T5577 Glass RFID Writeable tags Proximity Induction For animal identification or other 125KHz RFID Access controller. FEATURES: This tag very small so difficult to read or write,please use the better device or sensor strong device. Operation frequency: 125Khz Chip:T5577,Rewrite Writable EM4100 HID Chip(This Chip better and factory cost high than EM4305) Compatible with 125KHz EM4100 or 125KHz HID reader to gain access controller and the animal identification. Detecting distance: 0-5cm(if the Reader sensor Different so the Read Distance will Different ). Glass Housing Material:Bio-glass. Size:2.12 x12mm Page included: 2pcs 125KHz T5577 Writeable Glass RFID TAGS Shipping: We Ship to Worldwide. Import duties, taxes and charges are not included in the item price or shipping charges. These charges are the buyer’s responsibility. Please check with your country’s customs office to determine what these additional costs will be prior to bidding/buying. The item will be shipped out within 48 hours on the weekdays ( Monday to Friday ) or the next business days on the weekend after full payment must be received. Only ship to the Address. Please make sure your address in is Correct before you pay. we are not responsible for any wrong or undeliverable addresses. We will ship out the item by AirMail from China or Hong Kong Post Office. If want send by DHL UPS EMS or other Express shipping please contact me to change the shipping cost. We will send the item as " GIFT " It takes about 15-40 working days to arrive. Sometimes take a little longer , Due to Local dispatch or other reasons, It might goes more than 20 days . Payment We accept PayPal only. All major credit cards are accepted through our secure payment processor PayPal. Payment must be received within 10 days of auction closing. Refunds Returns If you do not satisfied with your purchase, or if it is damaged when receive, please let us know, we will do our best to help. If the problem cannot be solved, please return it to me in the condition it was received within 7 days. we will send you replacement or give you a refund. All returns should include all original items undamaged, in re-saleable condition, all original packaging including manuals, warranty forms. Buyers is responsible for the returning shipping cost. We care about our valued customers, and will always try to help you. So if you have any problems, please message us immediately. Please give us the opportunity to resolve any problem. We understand the concerns and frustrations you might have, and will try our best to resolve the issues.Please contact us BEFORE leaving any negative or neutral feedback or open any dispute on paypal.