It is an application that changes the altitude limit of Ryze Tech's drones "Tello".
It is maximum 30 m.

iOS version. Search by "TALS" in AppStore.
https://itunes.apple.com/us/app/telloaltlimitsetter/id1382095075?l=ja&ls=1&mt=8

-Usage
1. Connect the smartphone to Tello's Wi-Fi.
2. Launch TelloAltLimitSetter.
3. Change the set value with the seek bar.
4. Tap 'Rewrite altitude limit' button.

When rewriting is successful "current altitude limit value" will be rewritten.

■ Attention
-Fix the problem later.
-This application is irrelevant to Ryze Tech and DJI.
-The use of this application is self-responsibility. The results are not guaranteed. We do not guarantee anything.
-If it is set to 10 m or more there is a danger of crash or airframe loss due to the influence of wind and Wi-Fi loss. Please judge the situation and use it.

■Reference
https://github.com/Kragrathea/TelloPC
https://dl-cdn.ryzerobotics.com/downloads/tello/0228/Tello+SDK+Readme.pdf
https://drive.google.com/file/d/1t12MK-jG4df90gMjD8syPrAZ8VmdqCDA/view
https://gobot.io/blog/2018/04/20/hello-tello-hacking-drones-with-go/

■Written article
Tello & C#
https://note.mu/keizi666/n/n68eb25c8aa59

Tello & Java
https://note.mu/keizi666/n/nddef168ffb76

Tello & Swift
https://note.mu/keizi666/n/nc0e3d3cd3a21

■I designed some parts for Tello
https://www.thingiverse.com/keizi666/designs