diff --git a/sample_updater/src/com/example/android/systemupdatersample/PayloadSpec.java b/sample_updater/src/com/example/android/systemupdatersample/PayloadSpec.java
new file mode 100644
index 0000000..90c5637
--- /dev/null
+++ b/sample_updater/src/com/example/android/systemupdatersample/PayloadSpec.java
@@ -0,0 +1,122 @@
+/*
+ * 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 com.example.android.systemupdatersample;
+
+import android.os.UpdateEngine;
+
+import java.util.List;
+
+/**
+ * Payload that will be given to {@link UpdateEngine#applyPayload)}.
+ */
+public class PayloadSpec {
+
+    /**
+     * Creates a payload spec {@link Builder}
+     */
+    public static Builder newBuilder() {
+        return new Builder();
+    }
+
+    private String mUrl;
+    private long mOffset;
+    private long mSize;
+    private List<String> mProperties;
+
+    public PayloadSpec(Builder b) {
+        this.mUrl = b.mUrl;
+        this.mOffset = b.mOffset;
+        this.mSize = b.mSize;
+        this.mProperties = b.mProperties;
+    }
+
+    public String getUrl() {
+        return mUrl;
+    }
+
+    public long getOffset() {
+        return mOffset;
+    }
+
+    public long getSize() {
+        return mSize;
+    }
+
+    public List<String> getProperties() {
+        return mProperties;
+    }
+
+    /**
+     * payload spec builder.
+     *
+     * <p>Usage:</p>
+     *
+     * {@code
+     *   PayloadSpec spec = PayloadSpec.newBuilder()
+     *     .url("url")
+     *     .build();
+     * }
+     */
+    public static class Builder {
+        private String mUrl;
+        private long mOffset;
+        private long mSize;
+        private List<String> mProperties;
+
+        public Builder() {
+        }
+
+        /**
+         * set url
+         */
+        public Builder url(String url) {
+            this.mUrl = url;
+            return this;
+        }
+
+        /**
+         * set offset
+         */
+        public Builder offset(long offset) {
+            this.mOffset = offset;
+            return this;
+        }
+
+        /**
+         * set size
+         */
+        public Builder size(long size) {
+            this.mSize = size;
+            return this;
+        }
+
+        /**
+         * set properties
+         */
+        public Builder properties(List<String> properties) {
+            this.mProperties = properties;
+            return this;
+        }
+
+        /**
+         * build {@link PayloadSpec}
+         */
+        public PayloadSpec build() {
+            return new PayloadSpec(this);
+        }
+    }
+}