Shipping from US, due to the current situation, it may takes 7-14 days to delivery (except the special case) Replacing the cover after each use can avoid cross-contamination between different users. Ensure the accurate: Extra thin cover ensure the high accurate measurement. What??s more, fitting a new Braun lens filter each time ensures that dirt or ear wax don??t build up and clog the sensor window, which could lead to inaccurate temperature readings. ??For All Braun ThermoScan Models??: The ear thermometer covers are compatible for all Braun thermoscan models including Exactemp Thermoscan 7 IRT 6520, IRT6020, IRT6500, Braun Thermoscan 3 IRT3030, IRT3020, IRT4020, IRT4524 etc.