diff --git a/controls-core/src/commonMain/kotlin/ru/mipt/npm/controls/properties/DeviceBySpec.kt b/controls-core/src/commonMain/kotlin/ru/mipt/npm/controls/properties/DeviceBySpec.kt
index 4a77084..7f7f478 100644
--- a/controls-core/src/commonMain/kotlin/ru/mipt/npm/controls/properties/DeviceBySpec.kt
+++ b/controls-core/src/commonMain/kotlin/ru/mipt/npm/controls/properties/DeviceBySpec.kt
@@ -1,8 +1,13 @@
 package ru.mipt.npm.controls.properties
 
 import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.Deferred
+import kotlinx.coroutines.async
 import kotlinx.coroutines.flow.MutableSharedFlow
 import kotlinx.coroutines.flow.SharedFlow
+import kotlinx.coroutines.launch
+import kotlinx.coroutines.sync.Mutex
+import kotlinx.coroutines.sync.withLock
 import ru.mipt.npm.controls.api.ActionDescriptor
 import ru.mipt.npm.controls.api.Device
 import ru.mipt.npm.controls.api.PropertyDescriptor
@@ -10,19 +15,20 @@ import space.kscience.dataforge.context.Context
 import space.kscience.dataforge.context.Global
 import space.kscience.dataforge.meta.Meta
 import space.kscience.dataforge.meta.MetaItem
-import space.kscience.dataforge.meta.TypedMetaItem
-import kotlin.jvm.Synchronized
 
 /**
  * @param D recursive self-type for properties and actions
  */
-public open class DeviceBySpec<D: DeviceBySpec<D>> : Device {
+public open class DeviceBySpec<D : DeviceBySpec<D>> : Device {
     override var context: Context = Global
         internal set
+
     public var meta: Meta = Meta.EMPTY
         internal set
+
     public var properties: Map<String, DevicePropertySpec<D, *>> = emptyMap()
         internal set
+
     public var actions: Map<String, DeviceActionSpec<D, *, *>> = emptyMap()
         internal set
 
@@ -36,16 +42,27 @@ public open class DeviceBySpec<D: DeviceBySpec<D>> : Device {
 
     private val logicalState: HashMap<String, MetaItem?> = HashMap()
 
-    private val _propertyFlow: MutableSharedFlow<Pair<String, TypedMetaItem<*>>> = MutableSharedFlow()
+    private val _propertyFlow: MutableSharedFlow<Pair<String, MetaItem>> = MutableSharedFlow()
 
     override val propertyFlow: SharedFlow<Pair<String, MetaItem>> get() = _propertyFlow
 
     @Suppress("UNCHECKED_CAST")
-    internal val self: D get() = this as D
+    internal val self: D
+        get() = this as D
 
-    @Synchronized
-    private fun setLogicalState(propertyName: String, value: MetaItem?) {
-        logicalState[propertyName] = value
+    internal fun getLogicalState(propertyName: String): MetaItem? = logicalState[propertyName]
+
+    private val stateLock = Mutex()
+
+    internal suspend fun setLogicalState(propertyName: String, value: MetaItem?) {
+        if (value != logicalState[propertyName]) {
+            stateLock.withLock {
+                logicalState[propertyName] = value
+            }
+            if (value != null) {
+                _propertyFlow.emit(propertyName to value)
+            }
+        }
     }
 
     /**
@@ -54,10 +71,7 @@ public open class DeviceBySpec<D: DeviceBySpec<D>> : Device {
     public suspend fun readProperty(propertyName: String): MetaItem {
         val newValue = properties[propertyName]?.readItem(self)
             ?: error("A property with name $propertyName is not registered in $this")
-        if (newValue != logicalState[propertyName]) {
-            setLogicalState(propertyName, newValue)
-            _propertyFlow.emit(propertyName to newValue)
-        }
+        setLogicalState(propertyName, newValue)
         return newValue
     }
 
@@ -65,7 +79,9 @@ public open class DeviceBySpec<D: DeviceBySpec<D>> : Device {
         logicalState[propertyName] ?: readProperty(propertyName)
 
     override suspend fun invalidateProperty(propertyName: String) {
-        logicalState.remove(propertyName)
+        stateLock.withLock {
+            logicalState.remove(propertyName)
+        }
     }
 
     override suspend fun setProperty(propertyName: String, value: MetaItem) {
@@ -80,4 +96,20 @@ public open class DeviceBySpec<D: DeviceBySpec<D>> : Device {
 
     override suspend fun execute(action: String, argument: MetaItem?): MetaItem? =
         actions[action]?.executeItem(self, argument)
+}
+
+
+public operator fun <D : DeviceBySpec<D>, T : Any> D.get(
+    propertySpec: DevicePropertySpec<D, T>
+): Deferred<T> = scope.async {
+    propertySpec.read(this@get).also {
+        setLogicalState(propertySpec.name, propertySpec.converter.objectToMetaItem(it))
+    }
+}
+
+public operator fun <D : DeviceBySpec<D>, T : Any> D.set(propertySpec: WritableDevicePropertySpec<D, T>, value: T) {
+    scope.launch {
+        propertySpec.write(this@set, value)
+        invalidateProperty(propertySpec.name)
+    }
 }
\ No newline at end of file
diff --git a/controls-core/src/commonMain/kotlin/ru/mipt/npm/controls/properties/DeviceSpec.kt b/controls-core/src/commonMain/kotlin/ru/mipt/npm/controls/properties/DeviceSpec.kt
index fce0a81..f1cd375 100644
--- a/controls-core/src/commonMain/kotlin/ru/mipt/npm/controls/properties/DeviceSpec.kt
+++ b/controls-core/src/commonMain/kotlin/ru/mipt/npm/controls/properties/DeviceSpec.kt
@@ -1,5 +1,6 @@
 package ru.mipt.npm.controls.properties
 
+import kotlinx.coroutines.Deferred
 import ru.mipt.npm.controls.api.ActionDescriptor
 import ru.mipt.npm.controls.api.PropertyDescriptor
 import space.kscience.dataforge.context.Context
@@ -8,6 +9,7 @@ import space.kscience.dataforge.meta.Meta
 import space.kscience.dataforge.meta.transformations.MetaConverter
 import kotlin.properties.PropertyDelegateProvider
 import kotlin.properties.ReadOnlyProperty
+import kotlin.reflect.KProperty
 
 public abstract class DeviceSpec<D : DeviceBySpec<D>>(
     private val buildDevice: () -> D
@@ -44,7 +46,7 @@ public abstract class DeviceSpec<D : DeviceBySpec<D>>(
         read: suspend D.() -> T,
         write: suspend D.(T) -> Unit
     ): PropertyDelegateProvider<DeviceSpec<D>, ReadOnlyProperty<DeviceSpec<D>, WritableDevicePropertySpec<D, T>>> =
-        PropertyDelegateProvider { _: DeviceSpec<D>, property ->
+        PropertyDelegateProvider { _: DeviceSpec<D>, property: KProperty<*> ->
             val propertyName = name ?: property.name
             val deviceProperty = object : WritableDevicePropertySpec<D, T> {
                 override val name: String = propertyName