Wired Remote Shutter Release for Sony A7S3 A7R4 A9M2 A7M3 A7R3 ZV-1 A6100 A6600

For long exposures, just press the release button fully and slide it into the locked position. The shutter will stay open as long as the shutter release button is locked. To unlock the shutter, just slide the release button back to its original position.

eBay