Attach TrackR to keys, wallets and more. When an item goes missing, just tap the TrackR app to make your Bluetooth tracker ring loudly.
If you're looking for GPS capabilities, the initial costs can be high but you'll also be paying a (monthly) recurring fee for GSM/cellular data. The return on spend may be justified on a larger bird but probably not the Tello, IMO. Your $$ to spend. Caveat emptor.
Amazon.com: Tracki 2021 Model Mini Real time GPS Tracker. Full USA & Worldwide Coverage. for Vehicles, Car, Kids, Elderly, Child, Dogs & Motorcycles. Magnetic Small Portable Tracking Device. Monthly fee Required: MP3 Players & Accessories
Buy Marco Polo Ultralight Drone/UAV/Model Rocket Location and Recovery System – No GPS or Cell Service Required – No Monthly Fees – Never Lose your Drone Again - Starter System for 1 Aircraft: GPS Trackers - Amazon.com ✓ FREE DELIVERY possible on eligible purchases