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USB Port Blocker, 1-Key & 4-Lock (Pink Color), Prevent Unauthorized Access. Use this port blocker to prevent other devices from being connected to the system. Keep out devices such as Pen Drive, Mass Storage Devices, Cell Phone Adapters, and more. The port blocker includes a "key" which is used to lock in and remove the USB blockers. Syba USB Port Blocker with 1 Key and 4 USB Lock (SY-ACC20165) Syba SY-ACC20165 USB Port Blocker with 1 Key and 4 Locks