Works with Apple Find My: Use the pre-installed Find My* app and add Card to the Items tab. Ultra-Loud Alarm: Despite being only 2.4mm thick, Card can sound an alarm so loud you can hear it even if it's covered. Water-Resistant with Non-Replaceable and Non-Rechargeable Battery: Card can last up to 3 years and is safe even in the rain with its water-resistant coating. Find Your Phone in Silent Mode: Your phone rings even in Silent mode with just a double tap. Share with Everyone: With the eufy Security app, you can let others know the location of your items too. What's in the Box: SmartTrack Card, Metal Clip, and Quick Start Guide.