No need to buy extra. (Note: It CANNOT be paired with iOS and Android simultaneously.).
MiTag Duo Smart Tracker for iOS or Android Bluetooth Tracking Tag/Key
Kids smart watch Smart Tracker Watch LBS tracking technology Girls Boys Gift
Samsung Galaxy Fit3 Smart Tracker - Grey - SM-R390 + Extra Nylon Loop Strap
Goodmans Track+ Smart Tracker Watch Compatible with Apple Health
XIAOMI Smart Watch Sports Fitnes Tracker Blood Pressure Heart Rate Sleep Tracker
Smart Bracelet Fitness Tracker 5.3 Health Tracker Bracelet Water
