Widely used after locating lost pets, children, elderly people, vehicles (taxi, trucks, motorcycles, freezers, boats, etc.). Function: 1. Open the app and click the call button, the device will make a sound 2. Many people can use APP to find pets 3. The device can standby for 90-180 days, low battery reminder 4. One mobile phone can be connected to 20 monitoring devices at the same time 5. The anti-choking safety buckle will be automatically buckled when the external force exceeds 5 kg Strong anti-interference ability: The traditional wireless fence signal is easily disturbed by metal or obstacles. Your dog is often falsely reported to the police. The stability of GPS signal is much better than that of RF signal, so we use GPS technology to avoid the same situation. Problem, you never have to worry about your dog accidentally getting hurt. GREAT FOR OUTDOOR USE: No transmitter, no remote control, all functions are integrated in the collar, IP67 waterproof, easy to install and works