diff --git a/Krypton b/Krypton
index 8daa576..bdf56fd 160000
--- a/Krypton
+++ b/Krypton
@@ -1 +1 @@
-Subproject commit 8daa57641b5bf07b021df80f4c021a2bcea695a8
+Subproject commit bdf56fdcd3794550804594ef972e4e851a02ff9d
diff --git a/config.lua b/config.lua
index 90970ec..de7a64b 100644
--- a/config.lua
+++ b/config.lua
@@ -120,6 +120,8 @@
         modem = nil, -- Modem for inventories, if not specified, will use the first wired modem found
         speaker = nil, -- Speaker to play sounds on, if not specified, will use the first speaker found
         shopSyncModem = nil, -- Modem for ShopSync, if not specified, will use the first wireless modem found
+        blinker = nil, -- Side that a redstone lamp or other redstone device is on
+        -- Will be toggled on and off every 3 seconds to indicate that the shop is online
         exchangeChest = nil,
         outputChest = "self", -- Chest peripheral or self
         -- NOTE: Chest dropping is NYI in plethora 1.19, so do not use unless
@@ -129,7 +131,8 @@
         start = nil, -- function(version, config, products)
         purchase = nil, -- function(product, amount, refundAmount, transaction, transactionCurrency)
         failedPurchase = nil, -- function(transaction, transactionCurrency, product, errorMessage)
-        programError = nil -- function(err)
+        programError = nil, -- function(err)
+        blink = nil, -- function(blinkState) called every 3 seconds while shop is running
     },
     exchange = {
         -- Not yet implemented
diff --git a/core/ConfigValidator.lua b/core/ConfigValidator.lua
index f7915e4..0054730 100644
--- a/core/ConfigValidator.lua
+++ b/core/ConfigValidator.lua
@@ -105,6 +105,7 @@
         speaker = "speaker?",
         modem = "modem?",
         shopSyncModem = "modem?",
+        blinker = "enum<'left' | 'right' | 'front' | 'back' | 'top' | 'bottom'>?: side",
         exchangeChest = "chest?",
         outputChest = "chest",
     },
@@ -113,6 +114,7 @@
         purchase = "function?",
         failedPurchase = "function?",
         programError = "function?",
+        blink = "function?",
     },
     shopSync = {
         enabled = "boolean?",
diff --git a/core/ShopState.lua b/core/ShopState.lua
index 2713df0..80962ff 100644
--- a/core/ShopState.lua
+++ b/core/ShopState.lua
@@ -4,6 +4,7 @@
 local sound = require("util.sound")
 local eventHook = require("util.eventHook")
 
+local blinkFrequency = 3
 local shopSyncFrequency = 30
 local shopSyncChannel = 9773
 
@@ -256,6 +257,18 @@
             sleep(math.min(1, state.config.settings.categoryCycleFrequency))
         end
     end, function()
+        local blinkState = false
+        while state.running do
+            blinkState = not blinkState
+            if state.config.peripherals.blinker then
+                redstone.setOutput(state.config.peripherals.blinker, blinkState) 
+            end
+            if state.config.hooks and state.config.hooks.blink then
+                eventHook.execute(state.config.hooks.blink, blinkState)
+            end
+            sleep(blinkFrequency)
+        end
+    end, function()
         while state.running do
             sleep(shopSyncFrequency)
             if state.config.shopSync and state.config.shopSync.enabled and state.shopSyncModem then
diff --git a/radon.lua b/radon.lua
index 8e49bba..2df55be 100644
--- a/radon.lua
+++ b/radon.lua
@@ -1,7 +1,7 @@
 local oldPullEvent = os.pullEvent
 os.pullEvent = os.pullEventRaw
 
-local version = "1.1.9"
+local version = "1.1.10"
 
 --- Imports
 local _ = require("util.score")