diff --git a/poetry.lock b/poetry.lock
index 5c77a36..2570341 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -26,10 +26,21 @@ category = "main"
 optional = false
 python-versions = ">=3.7"
 
+[[package]]
+name = "pyserial"
+version = "3.5"
+description = "Python Serial Port Extension"
+category = "main"
+optional = false
+python-versions = "*"
+
+[package.extras]
+cp2110 = ["hidapi"]
+
 [metadata]
 lock-version = "1.1"
 python-versions = "^3.10"
-content-hash = "ce4feb2a6a42610a01d5e986a40980aaf9f73c3fdc2368f55ec75e70f39c70cf"
+content-hash = "9d0dcef05f7296031f76c658f997974caf9b45c1efa59678ef5823b803580e43"
 
 [metadata.files]
 pyqt5 = [
@@ -64,3 +75,7 @@ pyqt5-sip = [
     {file = "PyQt5_sip-12.11.0-cp39-cp39-win_amd64.whl", hash = "sha256:42320e7a94b1085ed85d49794ed4ccfe86f1cae80b44a894db908a8aba2bc60e"},
     {file = "PyQt5_sip-12.11.0.tar.gz", hash = "sha256:b4710fd85b57edef716cc55fae45bfd5bfac6fc7ba91036f1dcc3f331ca0eb39"},
 ]
+pyserial = [
+    {file = "pyserial-3.5-py2.py3-none-any.whl", hash = "sha256:c4451db6ba391ca6ca299fb3ec7bae67a5c55dde170964c7a14ceefec02f2cf0"},
+    {file = "pyserial-3.5.tar.gz", hash = "sha256:3c77e014170dfffbd816e6ffc205e9842efb10be9f58ec16d3e8675b4925cddb"},
+]
diff --git a/pyproject.toml b/pyproject.toml
index 9f88869..1a7d44b 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -7,6 +7,7 @@ authors = ["Your Name <you@example.com>"]
 [tool.poetry.dependencies]
 python = "^3.10"
 PyQt5 = "^5.15.7"
+pyserial = "^3.5"
 
 [tool.poetry.dev-dependencies]
 
diff --git a/test.py b/test.py
index b28f8f4..a3a0c83 100644
--- a/test.py
+++ b/test.py
@@ -89,19 +89,23 @@ class AccumulatorData:
 
 class StackGuiElement:
     title: str
+    stack_id: int
     min_voltage_label: QLabel
     max_voltage_label: QLabel
     min_temp_label: QLabel
     max_temp_label: QLabel
     groupBox: QGroupBox
+    detail_popup: QWidget
 
-    def __init__(self, title: str):
+    def __init__(self, title: str, stack_id: int):
         self.title = title
+        self.stack_id = stack_id
         self.min_voltage_label = QLabel()
         self.max_voltage_label = QLabel()
         self.min_temp_label = QLabel()
         self.max_temp_label = QLabel()
         self.groupBox = QGroupBox()
+        self.detail_popup = None
         self.__post__init__()
 
     def __post__init__(self):
@@ -109,6 +113,8 @@ class StackGuiElement:
         l2 = QLabel("Max Voltage [V]")
         l3 = QLabel("Min Temperature [°C]")
         l4 = QLabel("Max Temperature [°C]")
+        popup_btn = QPushButton(self.title + " details")
+        popup_btn.clicked.connect(self.show_popup)
 
         l1.setAlignment(Qt.AlignLeft)
         l2.setAlignment(Qt.AlignLeft)
@@ -123,13 +129,15 @@ class StackGuiElement:
         grid = QGridLayout()
         grid.addWidget(l1, 0, 0)
         grid.addWidget(l2, 1, 0)
-        grid.addWidget(l3, 0, 2)
-        grid.addWidget(l4, 1, 2)
+        grid.addWidget(l3, 2, 0)
+        grid.addWidget(l4, 3, 0)
 
         grid.addWidget(self.min_voltage_label, 0, 1)
         grid.addWidget(self.max_voltage_label, 1, 1)
-        grid.addWidget(self.min_temp_label, 0, 3)
-        grid.addWidget(self.max_temp_label, 1, 3)
+        grid.addWidget(self.min_temp_label, 2, 1)
+        grid.addWidget(self.max_temp_label, 3, 1)
+
+        grid.addWidget(popup_btn, 0, 2)
 
         self.groupBox.setTitle(self.title)
         self.groupBox.setLayout(grid)
@@ -140,6 +148,60 @@ class StackGuiElement:
         self.min_temp_label.setNum(min(slave.cell_temps))
         self.max_temp_label.setNum(max(slave.cell_temps))
 
+    def show_popup(self):
+        if self.detail_popup is None:
+            self.detail_popup = StackPopup(self.stack_id)
+        self.detail_popup.show()
+
+
+class StackPopup(QWidget):
+    stack_id: int
+    voltage_labels: list[QLabel]
+    temp_labels: list[QLabel]
+
+    def __init__(self, stack_id: int):
+        super().__init__()
+        self.stack_id = stack_id
+        self.voltage_labels = []
+        self.temp_labels = []
+        layout = QVBoxLayout()
+        groupbox = QGroupBox()
+
+        grid = QGridLayout()
+
+        for i in range(len(data.slaves[stack_id].cell_voltages)):
+            l1 = QLabel(f"Voltage Cell {i}")
+            l2 = QLabel(f"Temperature Cell {i}")
+            l1.setAlignment(Qt.AlignLeft)
+            l2.setAlignment(Qt.AlignLeft)
+
+            l_v = QLabel()
+            l_v.setNum(data.slaves[stack_id].cell_voltages[i])
+            l_v.setAlignment(Qt.AlignLeft)
+            self.voltage_labels.append(l_v)
+
+            l_t = QLabel()
+            l_t.setNum(data.slaves[stack_id].cell_temps[i])
+            l_t.setAlignment(Qt.AlignLeft)
+            self.temp_labels.append(l_t)
+
+            grid.addWidget(l1, i, 0)
+            grid.addWidget(l2, i, 2)
+            grid.addWidget(l_v, i, 1)
+            grid.addWidget(l_t, i, 3)
+
+        groupbox.setTitle(f"Stack {stack_id}")
+        groupbox.setLayout(grid)
+        layout.addWidget(groupbox)
+        self.setLayout(layout)
+        self.update_data()
+        timer.timeout.connect(self.update_data)
+
+    def update_data(self):
+        for i in range(len(data.slaves[self.stack_id].cell_voltages)):
+            self.voltage_labels[i].setNum(data.slaves[self.stack_id].cell_voltages[i])
+            self.temp_labels[i].setNum(data.slaves[self.stack_id].cell_temps[i])
+
 
 class Window(QWidget):
 
@@ -227,7 +289,7 @@ class Window(QWidget):
         ### STACKS ###
         self.stack_gui_elements = []
         for i in range(N_SLAVES):
-            sge = StackGuiElement(f"Stack {i}")
+            sge = StackGuiElement(f"Stack {i}", i)
             sge.update_data_from_slave(data.slaves[i])
             self.stack_gui_elements.append(sge)
 
@@ -430,15 +492,16 @@ if __name__ == "__main__":
     data = AccumulatorData()
     rx_buf = bytes()
 
-    """
     if len(sys.argv) != 2:
         print(f"Usage: {sys.argv[0]} SERIAL-PORT", file=sys.stderr)
         sys.exit(os.EX_USAGE)
 
     SERIAL_PORT = sys.argv[1]
     print(SERIAL_PORT)
-    ser = serial.Serial(SERIAL_PORT, BITRATE, timeout=TIMEOUT)
-    """
+    try:
+        ser = serial.Serial(SERIAL_PORT, BITRATE, timeout=TIMEOUT)
+    except serial.serialutil.SerialException:
+        pass
 
     app = QApplication(sys.argv)
     gui = Window()