Based on this product's specifications, here are some alternatives and similar models
Floaty Bobber / Floating Grip for SJCam action cameras — model 0000003606 (water float accessory)
Summary description:
Floating bobber accessory for SJCam action cameras, model 0000003606. Designed to keep compatible SJCam cameras afloat during water activities, it provides buoyancy and an easy-to-grip floating handle for swimming, snorkeling, kayaking and other water sports. Simple attachment secures the camera and increases visibility on the water surface to prevent loss.