Not very good. Especially if you have several. You must not exceed the range or the device itself will turn off the alarm. Cannot track more than one at a time. .I could go on but overall they have a very long way to go before I would ever recommend buying them.
AFXOBO GPS Tracker Mini Triangle Bluetooth Intelligent Anti-Lost Alarm Device for Kids, Keys, and Luggage
7 Review
Spot X 2-Way Satellite Messaging, GPS Tracking with SOS Feature and X-HD-X-B Capability
6 Review
Jaybird S/M - Black: Stylish and High-Quality Wireless Earbuds (Discontinued by Manufacturer)
11 Review
π TKSTAR 3G Car GPS Tracker: Powerful Anti-theft Device with Strong Magnet & Real-Time Tracking for Vehicles
6 Review