# Connect the Camera Trigger

There is a Replay -to-PWM module in the camera box, It is used to convert Relay (TTL) to PWM triggering. (see below photo)

<figure><img src="https://1188996718-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FRhFrv15WYL5VnCVr2Lc7%2Fuploads%2FrdUysA4tRpCHswHlWdNi%2Ffe5a562876261cc0575ad9cddec0215.png?alt=media&#x26;token=aa649f68-579b-4a82-bcb5-e8500505ff7f" alt="" width="375"><figcaption></figcaption></figure>

<figure><img src="https://1188996718-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FRhFrv15WYL5VnCVr2Lc7%2Fuploads%2FCXgx8koYwxAyRV8yIGmQ%2Fa495bfafdd275b9398737d4c3014d51_%E5%89%AF%E6%9C%AC.png?alt=media&#x26;token=c39cff37-1be4-4133-8a7f-3e8d0af55164" alt="" width="563"><figcaption></figcaption></figure>

WITHOUT the Replay -to-PWM module, if user connect the shutter and GND ports directly to flight controller, then it is Relay (TTL) triggering.