diff --git a/checks/check_snmp_synology.py b/checks/check_snmp_synology.py
index bd6e552..7a3e9f1 100755
--- a/checks/check_snmp_synology.py
+++ b/checks/check_snmp_synology.py
@@ -8,7 +8,7 @@
     - https://easysnmp.readthedocs.io/en/latest/session_api.html
 """
 
-__version__     = '0.1.0'
+__version__     = '0.3.0'
 __author__      = 'anima'
 
 # imports
@@ -135,7 +135,7 @@ class SNMPSynologySysTempResource(nagiosplugin.Resource):
         self.session = session
 
     def probe(self) -> list:
-        """check system status (normal or failed).
+        """check system temperature in °C
         
         Returns:
             nagiosplugin.Metric: single metric element (return)
@@ -143,12 +143,48 @@ class SNMPSynologySysTempResource(nagiosplugin.Resource):
         baseoid = '.1.3.6.1.4.1.6574.1'
         oids = dict()
         result = self.session.get(baseoid + '.2.0').value
-        return nagiosplugin.Metric(name='systemp', value=int(result), context='systemp_scalar_context')
+        return nagiosplugin.Metric(name='systemp', value=int(result), uom='°C', context='systemp_scalar_context')
 
     def __init__(self, session) -> None:
         self.session = session
 
 
+#
+# Synology [DSM & DSM UC] Returns error if power supplies fail
+#
+class SNMPSynologyPowerSupplyResource(nagiosplugin.Resource):
+    def __init__(self, session) -> None:
+        self.session = session
+
+    def probe(self) -> list:
+        """check power supply status (normal or failed)
+        
+        Returns:
+            nagiosplugin.Metric: single metric element (return)
+        """
+        baseoid = '.1.3.6.1.4.1.6574.1'
+        result = self.session.get(baseoid + '.3.0').value
+        return nagiosplugin.Metric(name='status', value=result, context='powersupply_context')
+
+
+class SNMPSynologyPowerSupplyResult(nagiosplugin.Result):
+    def __str__(self):
+        if self.metric.value == '1': status = 'normal'
+        else: status = 'failed'
+        return f'Power Supply is in status {status}!'
+
+
+class SNMPSynologyPowerSupplyContext(nagiosplugin.Context):
+    def __init__(self, name):
+        super().__init__(name, fmt_metric='{name} is', result_cls=SNMPSynologyPowerSupplyResult)
+
+    def evaluate(self, metric, resource):
+        if metric.value == '2':
+            return self.result_cls(nagiosplugin.Critical, "critical", metric)
+        elif metric.value == '1':
+            return self.result_cls(nagiosplugin.Ok, "ok", metric)
+        return self.result_cls(nagiosplugin.Unknown, "unknown", metric)
+
 
 #
 # Arguments
@@ -172,6 +208,7 @@ def parse_args() -> argparse.Namespace:
         choices=[
             'system',
             'systemp',
+            'powersupply',
         ],
         help='check mode to run')
 
@@ -227,6 +264,11 @@ def main():
             nagiosplugin.ScalarContext(name='systemp_scalar_context', warning=args.warning, critical=args.critical),
             nagiosplugin.Summary())
             check.name = "System Temperatur"
+        case 'powersupply':
+            check = nagiosplugin.Check(SNMPSynologyPowerSupplyResource(session=session),
+            SNMPSynologyPowerSupplyContext(name='powersupply_context'),
+            nagiosplugin.Summary())
+            check.name = "Power Supply Status"
         case _:
             raise nagiosplugin.CheckError(f'Unknown check mode: {args.check_mode}')