Original Xiaomi Yi 4K Camera Bluetooth Remote Controller, Bluetooth Shutter for Xiaomi Yi II Action Camera
How to connect it to the camera:
1. Update your camera to the 1.1.0 version or above if still didn't.
2. Turn on the camera.
3. Press 2 times the Wi-fi button on your camera, it must be always ON then, not blinking.
4. Remote controller is connected, enjoy!

Compatible also with phone which has Bluetooth above 4.0

Notice: it's not waterproof but can survive rain for example.