Anti-lost alarm and two-way search by phone: Click the "Call Device" on "Search" to trigger the intelligent person-finding alarm and find your device with one click. You can also easily find your phone by triggering its ring tone by double-clicking the button on the smart viewfinder. Disconnection alarm:When your items and phone are out of Bluetooth range for a period of time, a prompt will -up on your phone.Multiple devices online at the same time: Multiple devices can be added and managed for use on your phone, Pad, pod touch or . 60DB high volume:The sound is up to 60db, and the working diameter in an unobstructed open space can reach 20-50 meters. Up to 15-30 meters when there are obstacles indoors Connection memory and location recording: The mobile APP will record the last location when disconnected and -up a prompt to help find the lost device more easily.Support siri voice:Supports Siri voice calls to find device location. Notice:1. This product is not a WIFI product, but a Bluetooth product. The mobile phone's Bluetooth must be turned on when using it.2. Compatibility: only applicable to IOS system. (Each mobile phone has built-in search software, no need to download any software.)3. Battery: CR2032 (battery not included) Suitable for various places: This tracker device is mini portable and can easily fit into a purse or backpack. It can also be used as a keychain or accessory, hung around a backpack or pet's neck, making it versatile. Prevent children and the elderly from lost: track their whereabouts in real time. Prevent small pets from lost: Know the location of pets in real time, so you don't have to worry about pets running too fast and not being to find them. Prevent wallet from being lost: Mini portable design, easy to carry in your wallet. Prevent luggage from being lost: You don't have to worry about being picked up or lost by others when traveling. Prevent key loss: It can be used as a keychain and placed with the key, so you no longer have to worry about finding the key. Product parameters: Working current: 3.7mA Voltage: DC 3V Standby power consumption: 15uA Volume: 60 decibels Connection : Bluetooth 4.2 (does not support WIFI) Waterproof: Not waterproof Usage distance: Less than 25 meters indoors, Less than 50 meters in open spaces Working temperature and humidity: -20-50, humidity less than 90percent (no condensation) Due to different batches, there may be differences in product appearance, color, and printed text, which will not affect the use. Colour:A: Black Material:pc Package Contents: 1 x Anti-lost Tracker Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is 1-3cm.