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[zcash-android-wallet-sdk ](../../index.md ) / [cash.z.ecc.android.sdk ](../index.md ) / [SdkSynchronizer ](index.md ) / [start ](./start.md )
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# start
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`fun start(parentScope: CoroutineScope?): ` [`Synchronizer` ](../-synchronizer/index.md )
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Starts this synchronizer within the given scope. For simplicity, attempting to start an
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instance that has already been started will throw a [SynchronizerException.FalseStart ](../../cash.z.ecc.android.sdk.exception/-synchronizer-exception/-false-start.md )
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exception. This reduces the complexity of managing resources that must be recycled. Instead,
each synchronizer is designed to have a long lifespan and should be started from an activity,
application or session.
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### Parameters
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`parentScope` - the scope to use for this synchronizer, typically something with a
lifecycle such as an Activity for single-activity apps or a logged in user session. This
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scope is only used for launching this synchronizer's job as a child. If no scope is provided,
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then this synchronizer and all of its coroutines will run until stop is called, which is not
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recommended since it can leak resources. That type of behavior is more useful for tests.
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**Return**
an instance of this class so that this function can be used fluidly.
