diff --git a/src/outputs/callables.cpp b/src/outputs/callables.cpp
new file mode 100644
index 0000000..8f69040
--- /dev/null
+++ b/src/outputs/callables.cpp
@@ -0,0 +1,43 @@
+/*
+ * Copyright (C) 2020 CESNET, https://photonics.cesnet.cz/
+ *
+ * Written by Tomáš Pecka <tomas.pecka@fit.cvut.cz>
+ *
+*/
+
+#include "callables.h"
+#include "outputs/LedSysfsDriver.h"
+
+namespace velia {
+
+LedOutputCallback::LedOutputCallback(std::shared_ptr<LedSysfsDriver> red, std::shared_ptr<LedSysfsDriver> green, std::shared_ptr<LedSysfsDriver> blue)
+    : m_redLed(std::move(red))
+    , m_greenLed(std::move(green))
+    , m_blueLed(std::move(blue))
+{
+    m_redLed->set(0);
+    m_greenLed->set(0);
+    m_blueLed->set(0);
+}
+
+void LedOutputCallback::operator()(State state)
+{
+    switch (state) {
+    case State::ERROR:
+        m_redLed->set(255);
+        m_greenLed->set(0);
+        m_blueLed->set(0);
+        break;
+    case State::WARNING:
+        m_redLed->set(255);
+        m_greenLed->set(160);
+        m_blueLed->set(0);
+        break;
+    case State::OK:
+        m_redLed->set(0);
+        m_greenLed->set(255);
+        m_blueLed->set(0);
+        break;
+    }
+}
+}
\ No newline at end of file