1、Anti Lost Key Finder: Pair with the app and keep working on the back, your phone and key locator will alert you when offline, great for travel to avoid loss. 2、Two Way Anti Lost: Two way anti lost, the anti lost device can find the mobile phone, and the mobile phone can also find the anti lost device. 3、Compact Portable: Compact design for easy portability. You can keep it in your wallet as a wallet finder or in your bag with your phone as a phone finder or any other item finder. 4、Long Battery Life: Powered by a CR2032 battery with a super long standby time of over 10 months, and can be easily replaced for long term use. 5、Anti Lost Alarm: If you can't find your item, double tap the app button and it will make your phone beep to help you find the item quickly and easily. Item Type: Anti Lost Alarm Sensor Material: ABS Product Size: Approx. 42 x 40 x 10mm / 1.7 x 1.6 x 0.4in Wireless Distance: 12-30 Meters Wearing Method: Pendant Battery: CR2032 Button Battery (built In) Capacity: 190mah Shape: Dog Paw Weight: Approx. 15g / 0.5oz 1 x Anti Lost Alarm Sensor 1 x Lanyard 1 x User Manual