diff --git a/src/keyer.cpp b/src/keyer.cpp
index 72d5207..3e81201 100644
--- a/src/keyer.cpp
+++ b/src/keyer.cpp
@@ -40,6 +40,12 @@ Keyer::Keyer(uint8_t wpm, Mode mode) : m_wpm(wpm), m_mode(mode)
     m_elementDuration = calcElementDurationUs(m_wpm);
 }
 
+void Keyer::setSpeed(uint8_t wpm)
+{
+    m_wpm = wpm;
+    m_elementDuration = calcElementDurationUs(wpm);
+}
+
 void Keyer::run()
 {
     auto timestamp = get_absolute_time();
diff --git a/src/keyer.h b/src/keyer.h
index 1c48384..bc32db9 100644
--- a/src/keyer.h
+++ b/src/keyer.h
@@ -16,12 +16,15 @@ public:
         Dah,
         InterCharSpace,
     };
+    Keyer() = delete;
     Keyer(uint8_t wpm, Mode mode);
 
+    void setMode(Mode mode) { m_mode = mode; }
+    void setSpeed(uint8_t wpm);
+
     void run();
 
 private:
-    Keyer(){};
     State state{State::Wait};
     State m_previousState{State::Wait};
     uint8_t m_wpm{18};