Inventory System Unity

Im using Inventory system by Brackeys here, then i try to custom an equipment object just like the documentation says. I need that item enable Renderer Sprites component when object drag to weapon holder (inventory), and disable Renderer Sprites when object drag out from weapon holder. I'm implementation GetComponent(SpriteRenderer).enabled = true; for activating Renderer Sprites and GetComponent(SpriteRenderer).enabled = false; to disable, but the script seems don't work, when the object drag out from inventory, Renderer Sprites Component still active. here the part of script for enable/disable Renderer Sprites

 #pragma strict
 
 //This script allows you to create equipment effects that will be called either OnEquip or WhileEquipped. This is usefull for magic effects and stat handling.
 
 @script AddComponentMenu ("Inventory/Items/Equipment Effect")
 @script RequireComponent(Item)
 
 private var effectActive = false;
 
 function Update () 
 {
     if (effectActive == true)
     {
         //-----> THIS IS WHERE YOU INSERT CODE YOU WANT TO EXECUTE AS LONG AS THE ITEM IS EQUIPPED. <-----
         
         
     }
 }
 
 function EquipmentEffectToggle (effectIs : boolean)
 {
     if (effectIs == true)
     {
         effectActive = true;
         
         Debug.LogWarning("Remember to insert code for the EquipmentEffect script you have attached to " + transform.name + ".");
         
         //-----> THIS IS WHERE YOU INSERT CODE YOU WANT TO EXECUTE JUST WHEN THE ITEM IS EQUIPPED. <-----
     
             GetComponent(SpriteRenderer).enabled = true;
         
         
         
         
     }
     else
     {
         effectActive = false;
         
         //-----> THIS IS WHERE YOU INSERT CODE YOU WANT TO EXECUTE JUST WHEN THE ITEM IS UNEQUIPPED. <-----
 
             GetComponent(SpriteRenderer).enabled = false;
         
         //Destroy(gameObject);
         
     }
 }

is it correct implementation ? what should i do ?