The PocketWizard CM-E3 MotorDrive Cord for H1 is used to trigger the electronic shutter release of cameras with a Canon E3 or sub-miniphone remotely.This PocketWizard CM-E3 pre trigger motor cord has cable length of 3'The PocketWizard Motor Drive Cable has a pre-trigger switch, which keeps the shutter release button in half-pressed positionThis efficient camera accessory ensures quick and consistent camera responseWhen disabled, the H1 series motor drive cable behaves similar to CM-E3