diff --git a/common/src/main/kotlin/quaedam/projector/ProjectorBlock.kt b/common/src/main/kotlin/quaedam/projector/ProjectorBlock.kt
index 3a398ed..5779276 100644
--- a/common/src/main/kotlin/quaedam/projector/ProjectorBlock.kt
+++ b/common/src/main/kotlin/quaedam/projector/ProjectorBlock.kt
@@ -1,6 +1,7 @@
 package quaedam.projector
 
 import net.minecraft.core.BlockPos
+import net.minecraft.network.chat.Component
 import net.minecraft.server.level.ServerLevel
 import net.minecraft.util.RandomSource
 import net.minecraft.world.InteractionHand
@@ -15,6 +16,8 @@ import net.minecraft.world.level.block.state.BlockState
 import net.minecraft.world.level.material.MapColor
 import net.minecraft.world.level.material.PushReaction
 import net.minecraft.world.phys.BlockHitResult
+import quaedam.shell.ProjectionShellItem
+import quaedam.utils.sendBlockUpdated
 
 object ProjectorBlock : Block(Properties.of()
     .jumpFactor(0.8f)
@@ -41,6 +44,21 @@ object ProjectorBlock : Block(Properties.of()
         interactionHand: InteractionHand,
         blockHitResult: BlockHitResult
     ): InteractionResult {
+        if (player.getItemInHand(interactionHand).item == ProjectionShellItem) {
+            if (!level.isClientSide) {
+                val entity = level.getBlockEntity(blockPos) as ProjectorBlockEntity
+                var newRadius = entity.effectRadius + 1
+                if (newRadius > Projector.currentEffectRadius) {
+                    newRadius = 0
+                }
+                entity.updateEffectArea(newRadius)
+                entity.setChanged()
+                entity.sendBlockUpdated()
+                checkUpdate(level, blockPos)
+                player.sendSystemMessage(Component.translatable("quaedam.projector.radius_updated", newRadius))
+            }
+            return InteractionResult.sidedSuccess(level.isClientSide)
+        }
         checkUpdate(level, blockPos)
         return InteractionResult.PASS
     }
diff --git a/common/src/main/kotlin/quaedam/projector/ProjectorBlockEntity.kt b/common/src/main/kotlin/quaedam/projector/ProjectorBlockEntity.kt
index 48424ed..49a024d 100644
--- a/common/src/main/kotlin/quaedam/projector/ProjectorBlockEntity.kt
+++ b/common/src/main/kotlin/quaedam/projector/ProjectorBlockEntity.kt
@@ -70,7 +70,7 @@ class ProjectorBlockEntity(pos: BlockPos, state: BlockState) :
         updateEffects(effects, notify = false)
     }
 
-    private fun updateEffectArea(radius: Int) {
+    fun updateEffectArea(radius: Int) {
         effectRadius = radius
         val chunk = ChunkPos(SectionPos.blockToSectionCoord(blockPos.x), SectionPos.blockToSectionCoord(blockPos.z))
         val minChunk = ChunkPos(chunk.x - radius, chunk.z - radius)
diff --git a/common/src/main/resources/assets/quaedam/lang/en_us.json b/common/src/main/resources/assets/quaedam/lang/en_us.json
index 50ddc7c..15650ce 100644
--- a/common/src/main/resources/assets/quaedam/lang/en_us.json
+++ b/common/src/main/resources/assets/quaedam/lang/en_us.json
@@ -13,6 +13,7 @@
   "item.quaedam.projection_shell": "Projection Shell",
   "item.quaedam.iron_copper_metal": "Copper-iron Alloy",
   "item.quaedam.projection_metal": "Projection Metal",
+  "quaedam.projector.radius_updated": "Current effect radius: %s",
   "quaedam.screen.projection_shell": "Projection Shell",
   "quaedam.screen.projection_shell.lock_revoked": "Timeout! Connection Lost",
   "quaedam.screen.projection_shell.lock_failed": "Permission denied!",
diff --git a/common/src/main/resources/assets/quaedam/lang/zh_cn.json b/common/src/main/resources/assets/quaedam/lang/zh_cn.json
index e48a7a3..ebacb7a 100644
--- a/common/src/main/resources/assets/quaedam/lang/zh_cn.json
+++ b/common/src/main/resources/assets/quaedam/lang/zh_cn.json
@@ -13,6 +13,7 @@
   "item.quaedam.projection_shell": "投影操作面板",
   "item.quaedam.iron_copper_metal": "铜铁合金",
   "item.quaedam.projection_metal": "投影金属",
+  "quaedam.projector.radius_updated": "当前效果半径：%s",
   "quaedam.screen.projection_shell": "投影操作",
   "quaedam.screen.projection_shell.lock_revoked": "超时！连接丢失",
   "quaedam.screen.projection_shell.lock_failed": "正被使用",
diff --git a/common/src/main/resources/assets/quaedam/lang/zh_meme.json b/common/src/main/resources/assets/quaedam/lang/zh_meme.json
index 7e651e1..5cb7f1c 100644
--- a/common/src/main/resources/assets/quaedam/lang/zh_meme.json
+++ b/common/src/main/resources/assets/quaedam/lang/zh_meme.json
@@ -13,6 +13,7 @@
   "item.quaedam.projection_shell": "投射滥权终端",
   "item.quaedam.iron_copper_metal": "有点生锈的铁锭",
   "item.quaedam.projection_metal": "投影Metal©",
+  "quaedam.projector.radius_updated": "现在乱七八糟的效果能碰到的范围：%s",
   "quaedam.screen.projection_shell": "控制面板",
   "quaedam.screen.projection_shell.lock_revoked": "土豆熟了",
   "quaedam.screen.projection_shell.lock_failed": "宁配吗？",