HS-D2 is a free iPhone application developed by HOLY STONE TECHNOLOGY Co.Ltd. It falls under the category of Utilities & Tools and offers users the ability to control a toy quadrocopter using WiFi. One of the standout features of HS-D2 is its real-time video transfer capability.

With HS-D2, users can connect their iPhone to a toy quadrocopter and take control of its movements. The app utilizes WiFi technology to establish a seamless connection between the iPhone and the quadrocopter, allowing for precise control and navigation. Whether you want to fly the quadrocopter indoors or outdoors, HS-D2 provides a user-friendly interface that makes controlling the toy a breeze.

What sets HS-D2 apart from other similar apps is its real-time video transfer feature. Users can view live video footage from the quadrocopter's onboard camera directly on their iPhone screen. This not only enhances the overall flying experience but also allows users to capture stunning aerial shots and videos.

Overall, HS-D2 is a reliable and feature-rich application for controlling a toy quadrocopter. Its WiFi connectivity and real-time video transfer make it a standout choice for enthusiasts looking to explore the world of remote-controlled flying.