Manufactured with silver ion technology that kills up to 99. 9% of bacteria and viruses. Proven to be 96. 4% cleaner than standard handles. Certified to BS ISO 22196 and BS ISO 21702. Tested against human Corona virus and Vaccinia virus. Works continuously, 24/7 to reduce cross-contamination between users. Simply clipped over existing door handles with a dia of 19mm, 20mm or 22mm (these are the 3 most common in the UK). Colour: Metallic blue. Units must be replaced every 6 months when the time st
