HOTRC HT-8A remote control locking function, automatic shutdown function and battery usage

HT-8A remote control
1. Locking function: In order to prevent misoperation, the remote control can lock/fine adjustment keys/mixing control keys/large and small rudder volume keys/channel forward and reverse keys/.
2. Automatic shutdown function: In order to prevent forgetting to shut down, the remote control will enter the shutdown state after 15 minutes without any operation, and there will be a sound prompt 1 minute before shutting down.
3. Battery usage: Please use 4 AA batteries for the remote control. Please pay attention to the pros and cons of the batteries during installation. The remote control has reverse battery protection function.
When the power of the remote control is low, the power indicator light will flash and alarm, please replace the battery with a new one immediately. There is a 2S/2.54 terminal interface reserved in the battery compartment of the remote control, which can directly use 2S lithium batteries. Please do not use lithium batteries with a voltage higher than 2S.

[@tiago6939]

Whats the Speed Control i can use in this rádio?

[@jonsnow4712]

What about channels 5, 6, 7 and 8. How to set them. Not working on betaflight

[@ben_pilet]

an alarm sounds at start-up