This is an experimental technology
Check the Browser compatibility table carefully before using this in production.

The controlTransferOut() method of the USBDevice interface returns a promise that resolves with a USBOutTransferResult when a command or status operation has been transmitted from the USB device.


var promise = USBDevice.controlTransferOut(setup, data)


An object that sets options for . The available options are:
  • requestType: Must be one of three values specifying whether the tranfer is "standard" (common to all USB devices) "class" (common to an industry-standard class of devices) or "vendor".
  • recipient: Specifices the target of the transfer on the device, one of "device", "interface", "endpoint", or "other".
  • request: A vendor-specific command.
  • value: Vender-specific request parameters.
  • index: The interface number of the recipient.
A variable to contain the data that will be transfered out of the device.

Return value

A promise that resolves with a USBOutTransferResult.


Specification Status Comment
The definition of 'controlTransferOut()' in that specification.
Draft Initial definition.

Browser compatibility

FeatureChromeEdgeFirefoxInternet ExplorerOperaSafari
Basic support61 No No No48 No
FeatureAndroid webviewChrome for AndroidEdge mobileFirefox for AndroidOpera AndroidiOS SafariSamsung Internet
Basic support No61 No No48 No No

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Contributors to this page: jpmedley
Last updated by: jpmedley,