Reusable, RFID proximity badges are designed for use with the Lathem PayClock PC600 Touch-screen Time Clock, Special Recognition 700 and PC10. These badges are identical to those included with the original PayClock Express Kit. To use the PayClock Express system with more than 15 employees (up to 50), you can purchase additional sets of badges separately. These radio frequency badges also work with the Lathem LX100 door locks so you get one badge with two applications.