Depends what your thinking of installing tbh ,
ESB:
The Screen accurate had a helmet cradle and the wiring for the lights (no servo)
Chin strap and cup
This is how mine currently stands
Rangecfinder servo
Remote control units
Wiring for rangefinder topper lights
2 cooling fans
3 9v batteries
1 9v USB power bank
JB helmet cradle
Chin strap and cup
Voice changer is a separate unit outside of the helmet
It's a tight fit but my head also fits ......just lol