Driven by the same technology as breathtaking QS-220, QS-BT1 is a multi-purpose, dual channel, direct drive.Driven by the same technology as breathtaking QS-220, QS-BT1 is a multi-purpose, dual channel, direct drive.Driven by the same technology as breathtaking QS-220, QS-BT1 is a multi-purpose, dual channel, direct drive.Driven by the same technology as breathtaking QS-220, QS-BT1 is a multi-purpose, dual channel, direct drive.Driven by the same technology as breathtaking QS-220, QS-BT1 is a multi-purpose, dual channel, direct drive