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Model Number125Khz Key
Black Red Green Gray Yellow Blue Orange Blackish Green You can select all one color,for example "please send black". Or mixed color,for example "20pcs blue,30pcs red,30pcs yellow, 20pcs black". If not leave any messages, we will send by random, normally all in blue. Please note, TK4100 read-only and can not write. If you want to buy can rewrite the tags, you should buy EM4305 chip tags. Please open the link to purchase EM4305 chip tags.