You can use Bluetooth Headset as the remote controller of your phone to take a photo via BT Camera.
Use the following methods to shoot photo：
1. Turn on or turn off your Bluetooth Headset. (BT Camera will shoot automatically when bluetooth connected or disconnected with your Bluetooth Headset.)
2. Inset your Wired Headset, click Volume Up or Volume Down button to shoot.
3. Press Volume Up or Volume Down button of your phone to shoot.
4. Press the shoot icon on the screen of BT Camera application.

BT Camera supports all kinds of Bluetooth Headsets as the remote controller to take a photo! (Note: Bluetooth Headsets need to pair with your phone before use, and remember to turn on Bluetooth function on your phone.) It also supports all kinds of Wired Headsets to take a photo.

p.s. It takes a while to pair between Bluetooth Headsets and your phone, when Bluetooth Headsets turn on. Thus it also take a while to take picture. But it should take a photo immediately if the Bluetooth Headsets turn off. (You can distinguish if bluetooth is connected or disconnected to your Bluetooth Headsets via the appeared icon in the center of screen. And it is better to choose disconnect to trigger camera shoot.