The VD-420 Wireless Manual Flash from Bolt can be used as both a wireless slave and manual on-camera flash, providing plenty of creative options for flash placement. The included transmitter can be used to fire the flash from up to 50' away. The flash's output level can be manually adjusted from 1/128 to full power in eight full-stop increments. An LED provides a visual reference to the output level in bright or low-light environments. Optical wireless slave modes allow additional off-camera triggering for greater control over the light in your setup.