diff --git a/checks/check_snmp_synology.py b/checks/check_snmp_synology.py
index f5132ec..2caf02c 100755
--- a/checks/check_snmp_synology.py
+++ b/checks/check_snmp_synology.py
@@ -398,9 +398,6 @@ class SNMPSynologyCPUResource(nagiosplugin.Resource):
         result = self.session.get(baseoid + '.7.1.0').value
         return nagiosplugin.Metric(name='cpu', value=int(result), uom='%', context='cpu_scalar_context')
 
-    def __init__(self, session) -> None:
-        self.session = session
-
 
 #
 # Synology [DSM] Utilization % is the sum of user and system CPU usage
@@ -419,9 +416,6 @@ class SNMPSynologyMemoryResource(nagiosplugin.Resource):
         result = self.session.get(baseoid + '.7.2.0').value
         return nagiosplugin.Metric(name='memory', value=int(result), uom='%', context='memory_scalar_context')
 
-    def __init__(self, session) -> None:
-        self.session = session
-
 
 #
 # Synology [DSM & DSM UC] Checks disks
@@ -635,6 +629,54 @@ class SNMPSynologyRaidStatusResult(nagiosplugin.Result):
         return f'{self.metric.name} is in status {status}!'
 
 
+#
+# Synology [DSM & DSM UC] UPS staus (paused, not done)
+# 
+class SNMPSynologyUPSResource(nagiosplugin.Resource):
+    def __init__(self, session) -> None:
+        self.session = session
+
+    def probe(self) -> list:
+        """check memory usage in %
+        
+        Returns:
+            nagiosplugin.Metric: single metric element (return)
+        """
+        baseoid = '1.3.6.1.4.1.6574.4'
+        data = self.session.walk(baseoid)
+        # not sure if this value time remaining ...
+        time_until_empty = self.session.get(baseoid + '.3.6.1.0').value
+        # not shure what (for my ups) satus 'OL' says, maybe "online" ? 
+        ups = dict()
+
+        ups['status'] = self.session.get(baseoid + '.2.1.0').value
+        ups['model'] = self.session.get(baseoid + '.1.1.0').value
+        ups['serial'] = self.session.get(baseoid + '.1.3.0').value
+        return nagiosplugin.Metric(name='ups_' + ups["model"].lower().replace(' ', '_'), value=ups, context='ups_context')
+
+
+
+class SNMPSynologyUPSContext(nagiosplugin.Context):
+    def __init__(self, name):
+        super().__init__(name, fmt_metric='{name} is', result_cls=SNMPSynologyUPSResult)
+
+    def evaluate(self, metric, resource):
+        if metric.value['status']  == '?':
+            return self.result_cls(nagiosplugin.Critical, "critical", metric)
+        elif metric.value['status'] == '?':
+            return self.result_cls(nagiosplugin.Warn, "warning", metric)
+        elif metric.value['status'] == 'OL':
+            return self.result_cls(nagiosplugin.Ok, "ok", metric)
+        return self.result_cls(nagiosplugin.Unknown, "unknown", metric)
+
+
+class SNMPSynologyUPSResult(nagiosplugin.Result):
+    def __str__(self):
+        if self.metric.value['status'] == 'OL': status = 'Online' # ?
+        else: status = 'unknown'
+        return f'{self.metric.name} is in status {status}!'
+
+
 #
 # Arguments
 #
@@ -669,6 +711,7 @@ def parse_args() -> argparse.Namespace:
             'disk_sectors',
             'raid',
             'raid_space',
+            'ups',
         ],
         help='check mode to run')
 
@@ -785,6 +828,11 @@ def main():
             nagiosplugin.ScalarContext(name='raid_space_scalar_context', warning=args.warning, critical=args.critical),
             nagiosplugin.Summary())
             check.name = "Raid space usage"
+        case 'ups':
+            check = nagiosplugin.Check(SNMPSynologyUPSResource(session=session),
+            SNMPSynologyUPSContext(name='ups_context'),
+            SNMPSynologySummary())
+            check.name = "UPS status"
         case _:
             raise nagiosplugin.CheckError(f'Unknown check mode: {args.check_mode}')