BeLuvv Puppy - Bluetooth 4.0 App-based Proximity Device for Dogs Invisible Safety Strap - Signal coverage up to 45-meter radius, keep an eye on them from afar (obstruction in environment might affect signal) Water Resistant IPX 5 - Supports every occasion for your pet's favorite activities Long Lasting Battery Life - Up to 4 ~ 6 months battery life, more time for activity with less worries Family Guarding Circle - Invite close friends or families to help protect your furry friend together Globalized Co-Guard Network - The whole world is here to protect your pet from going missing