The anti-lost device can effectively use the distance, up to 10 meters in the open range. When your mobile phone is connected to the anti-lost device, if you only bring your mobile phone when you go out, and leave the anti-lost device about 10 meters away, the mobile phone and keychain will alert you. When you leave your mobile phone or anti-lost device at home, you can find the phone through the anti-lost device, or you can find the anti-lost device on your mobile phone.
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