Anti Germ Microbial Copper Alloy Smart Key. Touch free tool. Handy Pocket Size: 71 x 30 x 3mm. Keep it on your keyring. The Smart Key is a pocket sized solution that fits on your key fob and dramatically reduces contact areas. This simple device has been designed to help avoid these problems and acts as a buffer between the user and any potentially contaminated surfaces. It is made of copper alloy. Copper which is known for its antimicrobial properties kills up to 99.9% of bacteria within 2 hours of contact.