Computer, mobile phone APP to view baby and convenient. Convenient to set up management accounts and manage multiple devices. Ultra-small size, GPS positioning is accurate to within 5 meters, and can be located globally. Safety Fence: You can set up an area around the locator, and an alarm will be issued immediately when pets enter or leave the area. GPS Function: The pet tracker can locate your pet anywhere, and you can see the pets location and movement on your phone. Specification: Computer, mobile phone APP to view baby and convenient. Convenient to set up management accounts and manage multiple devices. Ultra-small size, GPS positioning is accurate to within 5 meters, and can be located globally. Safety Fence: You can set up an area around the locator, and an alarm will be issued immediately when pets enter or leave the area. GPS Function: The pet tracker can locate your pet anywhere, and you can see the pets location and movement on your phone. Size Chart: 000 # number # number # number # (Bind three mobile phone numbers) 111 (10 minutes pause for SMS recording) 222 (voice-controlled recording pauses for 5 minutes) 333 (voice-controlled call-back call) 444 (delete all contents of memory) 555 (turn off all functions) 666 (vibration alarm message) 777 (vibration alarm phone) 888 (play memory recording --- play as follows and then pause and play --- if there is a switch button, short press to pause) 999 (SMS positioning) Package Includes:(2 Pack) 1 X Locator 1 X Lanyard 1 X Silicone Case 1 X Data Cable 1 X Pet Collar