5pcs/lot Rewritable Rfid Touch Memory Key Ibutton. Feature TM Card, Also Known As Touch Memory, Electronic Key Stainless Steel Package with Su304 , Rugged, Never Rust, Corrosion; Resistant to Heat; Anti-variant; Sealing Strong; for Security Patrol, Sauna Door Locks,electronic Door Locks, Door Intercom, Card Systems, Identification, Banking, Communications, Rail Transportation, Transportation, and So Many Fields Information Ibutton RW1990 Memory 64, Can Be Repeated Rubbing, Write the Diy Code. SPECIFICATIONS Model Number: RW1990 Breakdown Rate:1/100,000 Serial Number:Only Global 64 Bit Numbers System Logic:64bits Pin Protection Memory:8kb RAM Inductive Type: Touch R/W and Encrypt R/W Times:1,500,000,000 Working Temperature:-40~85 . We are an international seller, your order will be shipped from abroad so please allow the necessary time of minimum 14 working days for delivery right now depending on where you ship to, due to ongoing delays in postal deliveries globally.