diff --git a/audio/effect/4.0/IAcousticEchoCancelerEffect.hal b/audio/effect/4.0/IAcousticEchoCancelerEffect.hal
new file mode 100644
index 0000000..f495e6f
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+++ b/audio/effect/4.0/IAcousticEchoCancelerEffect.hal
@@ -0,0 +1,32 @@
+/*
+ * Copyright (C) 2018 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package android.hardware.audio.effect@4.0;
+
+import android.hardware.audio.common@4.0;
+import IEffect;
+
+interface IAcousticEchoCancelerEffect extends IEffect {
+    /**
+     * Sets echo delay value in milliseconds.
+     */
+    setEchoDelay(uint32_t echoDelayMs) generates (Result retval);
+
+    /**
+     * Gets echo delay value in milliseconds.
+     */
+    getEchoDelay() generates (Result retval, uint32_t echoDelayMs);
+};