diff --git a/main.py b/main.py
index 1ad2963..0f8ae1a 100755
--- a/main.py
+++ b/main.py
@@ -79,10 +79,29 @@ class MainWindow(Gtk.Window):
         self.calendar = Gtk.Calendar()
         self.calendar.connect("day-selected", self.on_date_picked)
 
+        self.timeslots = Gtk.ListBox()
+        for slot in ["09:00", "15:00", "21:00"]:
+            print(slot)
+            row = Gtk.ListBoxRow()
+            hbox = Gtk.Box(orientation=Gtk.Orientation.HORIZONTAL, spacing=50)
+            row.add(hbox)
+            time_label = Gtk.Label(label=slot, xalign=0)
+            hbox.pack_start(time_label, True, True, 0)
+            hbox.pack_start(Gtk.CheckButton(), False, True, 0)
+            self.timeslots.add(row)
+
         self.synthesize_button = Gtk.Button(label="synthesize")
         self.listen_button = Gtk.Button(label="listen")
         self.clear_button = Gtk.Button(label="clear")
         self.save_button = Gtk.Button(label="save")
+        self.save_button.connect("clicked", self.on_transmission_saved)
+
+        # we need to put the buttons in a sizegroup to make the synthesize button the same length as the rest
+        self.right_sizegroup = Gtk.SizeGroup(mode=Gtk.SizeGroupMode.HORIZONTAL)
+        self.right_sizegroup.add_widget(self.synthesize_button)
+        self.right_sizegroup.add_widget(self.listen_button)
+        self.right_sizegroup.add_widget(self.clear_button)
+        self.right_sizegroup.add_widget(self.save_button)
 
 
 ######################### organise objects ###################################
@@ -106,8 +125,9 @@ class MainWindow(Gtk.Window):
 
         self.right_box.pack_start(self.date_time_box, True, True, pad)
         self.date_time_box.pack_start(self.calendar, True, True, 0)
+        self.date_time_box.pack_start(self.timeslots, True, True, 0)
 
-        self.right_box.pack_start(self.synthesize_listen_box, False, True, pad)
+        self.right_box.pack_start(self.synthesize_listen_box, False, True, 0)
         self.synthesize_listen_box.pack_start(self.synthesize_button, True, True, 0)
         self.synthesize_listen_box.pack_start(self.listen_button, True, True, 0)