2 PCS HYC-05 Round Bluetooth Anti-Lost Device Mobile Phone Key Two-Way Object Finding Alarm This anti-lost device is a product based on Bluetooth 4.0 low-power technology. By using the "iSearching" APP software to connect with mobile devices such as mobile phones via Bluetooth, the user can easily lose items (such as keys, handbags, etc.) Bundled together, it can realize the functions of anti-lost reminder and search for mobile phones. It can also realize functions such as remote control of photographing and recording (for example: group photo at party, selfie, etc.). Product Features: 1. Object-finding function: bind the anti-lost device to valuables. When the device is connected to the mobile phone APP Bluetooth, use the APPs search function to make the anti-lost device make a sound to find the item. 2. Find mobile phone function: When the device is connected with the mobile phone APP Bluetooth, when you need to find the mobile phone, double-click the device button to call the mobile phone, and the mobile phone will make a sound. 3. Two-way alarm: Set and open the "Bluetooth disconnection alarm" switch in the software to realize two-way anti-lost. When the device is connected to the Bluetooth of the mobile phone APP, if the Bluetooth of the mobile phone and the anti-lost device are disconnected, both the mobile phone and the anti-lost device will sound an alarm. 4. Selfie function: When the device is connected to the mobile phone APP Bluetooth, use the softwares Selfie function to take pictures wirelessly. 5. Recording function: double-click the switch button of the device to record in the APP. 6. Disconnect location: When the item is disconnected from the mobile phone APP Bluetooth, the APP will record the lost location of the item after disconnection, and the lost location will be displayed in the map in the APP after disconnection. Product parameters: 1. Product net weight: 10g 2. Material: ABS 3. Product size: 42x42x8mm 4. Battery: button battery CR2032 5. APP: isearching 6. Effective use dista