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Description of product use: 1. Bluetooth connection, Bluetooth v4.0 EDR communication protocol can connect 4 anti-lost devices at the same time. 2. Powerful function, two-way link (smartphones and anti-lost devices can control each other). 3. Extraordinary working hours Our devices have the ability to work for about 6 months by 3V CR2032 button battery power supply, no need to replace batteries frequently. 4. Intelligent alarm, when the anti-lost device exceeds the set Bluetooth range, the mobile phone and the anti-lost device will alarm at the same time; When the anti-lost device is disconnected, the map location on the mobile phone can be checked. 5. Anti-disturbance function, it can be set to mute for a certain period of time to prevent interruption during work and other important times; to set: Compatible System: Apple IOS 9.0 or above / Android 9.0 and Bluetooth 4.0 or above. Communication protocol: Bluetooth v4.0 EDR. Multitasking Management: One smartphone can manage up to 4 ant