diff --git a/FHEM/74_GardenaSmartDevice.pm b/FHEM/74_GardenaSmartDevice.pm
index ce951a6..801e015 100644
--- a/FHEM/74_GardenaSmartDevice.pm
+++ b/FHEM/74_GardenaSmartDevice.pm
@@ -407,12 +407,12 @@ sub Set {
     }
     elsif ( lc $cmd eq 'on' || lc $cmd eq 'off' || lc $cmd eq 'on-for-timer' ) {
         my $val = (
-            defined($aArg) && ref($aArg) eq 'ARRAY'
+            scalar(!@$aArg == 0) && ref($aArg) eq 'ARRAY'
             ? $aArg->[0] * 60
             : lc $cmd
         );
 
-        $payload = '"properties":{"value":"' . $val . '"}';
+        $payload = '"properties":{"name":"power_timer", "value":"' . $val . '"}';
     }
     ### Watering ic24
     elsif ( $cmd =~ m{\AmanualDurationValve\d\z}xms ) {
@@ -502,7 +502,7 @@ sub Set {
           if ( AttrVal( $name, 'model', 'unknown' ) eq 'sensor' 
             && ReadingsVal($name, 'device_info-category', 'unknown') eq 'sensor' );
 
-        $list .= 'on:noArg off:noArg on-for-timer:slider,0,1,60'
+        $list .= 'on:noArg off:noArg on-for-timer:slider,0,1,720'
           if ( AttrVal( $name, 'model', 'unknown' ) eq 'power' );
         # all devices has abilitie to fall a sleep
         $list .= ' winter_mode:awake,hibernate';
diff --git a/controls_GardenaSmartDevice.txt b/controls_GardenaSmartDevice.txt
index 852aaca..504f087 100644
--- a/controls_GardenaSmartDevice.txt
+++ b/controls_GardenaSmartDevice.txt
@@ -1,2 +1,2 @@
 UPD 2021-06-28_15:56:58 47009 FHEM/73_GardenaSmartBridge.pm
-UPD 2021-06-28_20:08:52 56188 FHEM/74_GardenaSmartDevice.pm
+UPD 2021-07-16_20:26:01 56217 FHEM/74_GardenaSmartDevice.pm