Ofeely Straight Extension Arm for Osmo Handheld 4K Camera and 3-Axis Gimbal Mount two accessories to your Osmo at the same time For Rosette-Mounted Accessories Mount Multiple Accessories at Once The Straight Extension Arm for Osmo from DJI allows you to use multiple rosette-based accessories at once It attaches in place of the mobile device holder, and can be used with the Bicycle Mount, Universal Mount, and mobile device holder all at the same time.