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Bullet points: 1. Two-way search, the mobile phone dials the bluetooth anti-lost keychain; the bluetooth anti-lost keychain calls the mobile phone. 2. The product can be used for the elderly, children, pets or valuables. 3. The Bluetooth connection range is within 50 meters. When the keychain is disconnected from the mobile phone for more than 50 meters, an audible alarm will sound. 4. The Bluetooth anti-lost keychain is a low-power Bluetooth product, using CR2032 button batteries, ordinary batteries can stand by for 8-12 months 5. Compatible platform: compatible for Android Android system: need to support Bluetooth 4.0, the system version must be 4.4 and above. Compatible for iOS system: It is recommended to use a system version compatible for iOS8 or higher.