Features:1.When your mobile phone exceeds a safe distance, the mobile phone will emit a sound reminder.2.When you forget to take your phone, the phone and the anti-lost device will make a sound at the same time optional.3.Call to find through the mobile APP, and the anti-lost device will have a sound reminder to help you locate your items.4.The mobile APP will display the location information on the map when the reminder is disconnected.5.Comes with a digital sticker, which can be combined into a contact number, giving you more possibilitise to retrieve the item.Notice:Actual color may be slightly different from the image due to different monitor and light effect.Please allow 1-3cm deviation due to manual measurement.This product does not have remote positioning function, it cannot track moving targets, it only locates the last disconnected lost position.BT version: 4.0Materials: ABS, steelProduct size: 92x35x10mmBattery type: button battery includedStandby time: 4-6 monthsConnection range: 12-15 metersColorStyle: As the picture shownPackage List:1 x Smart Alarm Reminder1 sheet of Number Sticker1 x Manual