MATERIAL: The Medical Alert Necklace are made from high polished stainless steel, Non Allergenic, Non Corrosive, Waterproof, Comfortable for skin, Excellent wear resistance. Laser deep engraving it is easy to read and vibrant, does not fade, permanent mark. SIZE: Pendant 0.86" x 1.37" (2.2cm x 3.5cm), Chain length 23.6" (50cm+5cm+5cm adjustable), weight 0.67 oz (19g). Manufacturer's Recommended Age 12+ SETUP AND USE: Scan the pendant QR code to activate the medical ID tag, Links to free online emergency medical profile page, Can enter basic medical info/ upload multiple photos/ Emergency Contacts/ Vital Medical Conditions/ Allergies/ Medications/ More space custom emergency medical ID information. One account can manage multiple medical ID tags. NO APP REQUIRED! NO SUBSCRIPTION FEES!!! PERSONALIZED MEDICAL ID: MYLUCKYTAG is a Digital Medical ID tag with a scannable QR code. Emergency personnel or anyone can quickly access critical information within 3 seconds by scanning your MYLUCKYTAG Medical Tag with a phone camera. Notify Emergency Contacts! Scanning the QR code on your MYLUCKYTAG medical ID triggers a GPS alert email to your emergency contacts. This exclusive feature is free in your MYLUCKYTAG online Emergency Medical profile. RESPONSIVE CUSTOMER SERVICE: If you have any issues at all, please find our contact information on our website and reach out. We will respond right away!